{ "$schema_version": "5.3", "review_mode": "fresh", "claim_restatement": { "index_wording": "Infectious Hypothesis of Alzheimer's", "entry_form": "phenomenon", "gradeable_restatement": "CNS infection by specific pathogens is a necessary initiating event in a substantial fraction of sporadic Alzheimer's disease.", "restatement_required": true, "split_into": [], "parent_claim": null, "scope_qualifiers": [ { "qualifier": "Pathogen identity, baseline CNS evidence, sporadic disease, prelesion stage and susceptibility fixed before outcome", "determinable_before_outcome": true, "determined_from": "Enrollment and experimental design, before results; no responder-defined scope.", "action": "retained" } ] }, "hypothesis": { "name": "Infectious Hypothesis of Alzheimer's", "central_claim": "CNS infection by specific pathogens is a necessary initiating event in a substantial fraction of sporadic Alzheimer's disease.", "proposed_mechanism": "CNS infection by specific pathogens is a necessary initiating event in a substantial fraction of sporadic Alzheimer's disease.", "claimed_scope": "CNS infection by specific pathogens is a necessary initiating event in a substantial fraction of sporadic Alzheimer's disease.", "claimed_level": [ "necessary initiation", "substantial sporadic fraction" ], "is_conjunctive": true, "conjunctive_note": "SC3 is the etiologic necessity/initiation gate, preserving the earlier user-stated hypothesis. Antimicrobial competence, pathogen detection, dementia prevention and treatment after AD onset cannot substitute for necessary CNS-pathogen initiation. Refresh preserves the earlier frozen review." }, "rubric_routing": { "primary_rubric": "01-neurodegeneration.md", "secondary_rubrics": [ "04-microbiome-systemic.md", "05-immunology-inflammation.md" ], "index_notes_applied": [ "SC3 is the etiologic necessity/initiation gate, preserving the earlier user-stated hypothesis. Antimicrobial competence, pathogen detection, dementia prevention and treatment after AD onset cannot substitute for necessary CNS-pathogen initiation. Refresh preserves the earlier frozen review." ], "rubric_fit_note": "Exact archived v5.3 framework. Any stale index empirical framing is rechecked against primary results." }, "subclaim_matrix": { "subclaims": [ { "id": "SC1", "statement": "Amyloid-beta can provide antimicrobial or pathogen-entrapment function.", "subclaim_type": "mechanism", "scope": "defined microbial and host concentrations/models", "claimed_scope": "defined microbial and host concentrations/models", "governing_rubric": "01-neurodegeneration.md", "key_evidence_anchor": "Pathogen challenge with peptide-specific loss and rescue", "hsef_level": "Ε", "confidence": "Moderate", "governing_cap_or_threshold": "Quoted boundary and upward audit below.", "rationale": "Synthetic/homogenate specificity and mouse/worm infection outcomes support antimicrobial or entrapment competence in defined models. Acute host protection is credited without equating it with beneficial chronic human plaque deposition; physiologic exposure and chronic tradeoffs prevent stronger broad inference." }, { "id": "SC2", "statement": "Specific pathogens are enriched in AD brains beyond controls.", "subclaim_type": "existence", "scope": "sporadic AD with contamination-controlled age-matched samples", "claimed_scope": "sporadic AD with contamination-controlled age-matched samples", "governing_rubric": "01-neurodegeneration.md", "key_evidence_anchor": "Validated microbial burden and orthogonal detection", "hsef_level": "Β", "confidence": "Moderate", "governing_cap_or_threshold": "Quoted boundary and upward audit below.", "rationale": "Several pathogens or components are reported in AD brains, but reproducibility and specificity differ. HSV controls, HHV read-mapping/DDPCR challenges, failed Chlamydia/Borrelia replication, inherited integration and contamination remain. For the registered contamination-controlled human enrichment scope, associations do not establish a reproducible initiating burden." }, { "id": "SC3", "statement": "CNS infection is necessary to initiate a substantial etiologic fraction of sporadic AD.", "subclaim_type": "necessity", "scope": "sporadic human AD with antecedent pathogen identity and exposure", "claimed_scope": "sporadic human AD with antecedent pathogen identity and exposure", "governing_rubric": "01-neurodegeneration.md", "key_evidence_anchor": "Early specific prevention/removal and mediated AD incidence", "hsef_level": "Γ", "confidence": "Moderate", "governing_cap_or_threshold": "Quoted boundary and upward audit below.", "rationale": "Native human necessity and an attributable substantial fraction have not been demonstrated. Mechanistic infection models and vaccine natural experiments exceed mere colocalization, but they do not locate the causal mediator in CNS infection before AD. Post-onset valacyclovir failure is bounded counterevidence to ongoing treatable HSV replication, not proof against every prespecified earlier hit." }, { "id": "SC4", "statement": "Pathogen entry precedes BBB failure and AD lesions.", "subclaim_type": "mechanism", "scope": "human preclinical disease trajectories", "claimed_scope": "human preclinical disease trajectories", "governing_rubric": "01-neurodegeneration.md", "key_evidence_anchor": "Longitudinal temporal and tissue evidence", "hsef_level": "Β", "confidence": "Moderate", "governing_cap_or_threshold": "Quoted boundary and upward audit below.", "rationale": "Prediagnostic serology and repeated infection models offer temporal clues, yet peripheral positivity and clinical diagnosis precede neither proven BBB failure nor first AD lesions. Late autopsies, tissue localization and plasma biomarker shifts do not directly order CNS pathogen entry before preclinical pathology." } ], "aggregation_rule": "scope-matched", "aggregation_preregistered": true, "aggregation_rationale": "SC3 is the etiologic necessity/initiation gate, preserving the earlier user-stated hypothesis. Antimicrobial competence, pathogen detection, dementia prevention and treatment after AD onset cannot substitute for necessary CNS-pathogen initiation. Refresh preserves the earlier frozen review.", "primary_subclaim_id": "SC3", "aggregation_derivation": "Γ for the preregistered SC3 etiologic gate. Scope-matched and primary-subclaim rules return Γ; weakest-link Β is shown separately for unverified enrichment/entry-order gates. No blanket Gamma cap is imposed on the vaccine/genetic/intervention set. The unmet positive burden is pathogen-specific CNS initiation with a measured substantial human fraction; dementia prevention, antimicrobial activity and imposed infection capability do not jointly measure it. Defined antimicrobial competence earns Ε and vaccine effects on recorded dementia receive full causal credit separately.", "aggregation_alternatives": { "weakest_link_would_return": "Β", "primary_subclaim_would_return": "Γ", "scope_matched_would_return": "Γ", "note": "Separate narrow successes do not replace the preregistered gate." }, "index_rule_deviation": "" }, "competing_models": { "models_evaluated": [ { "rank_in_tournament": 1, "model_id": "M2", "is_nominal": false, "name": "Noninfectious APP/proteostasis contribution", "core_claim": "APP processing and proteostasis can alter disease risk without demonstrating infection as an obligatory mediator.", "explains_what_nominal_does_not": "APP processing and proteostasis can alter disease risk without demonstrating infection as an obligatory mediator.", "strongest_supporting_evidence": [ "A673T human protection and reduced cleavage provide a molecular alternative (PMID22801501)." ], "strongest_contradictory_evidence": [ "This corpus does not adjudicate the entire amyloid cascade or show that infection never interacts with APP." ], "hsef_level_for_this_model": "Ε", "rationale": "A673T human protection and reduced cleavage provide a molecular alternative (PMID22801501). This corpus does not adjudicate the entire amyloid cascade or show that infection never interacts with APP." }, { "rank_in_tournament": 2, "model_id": "M4", "is_nominal": false, "name": "Sterile/systemic immune and vascular contribution", "core_claim": "Systemic inflammatory and immune states can influence vulnerability without CNS pathogen initiation.", "explains_what_nominal_does_not": "Systemic inflammatory and immune states can influence vulnerability without CNS pathogen initiation.", "strongest_supporting_evidence": [ "AS01 cross-pathogen vaccine associations, terminal infection vascular differences and COVID biomarker shifts fit indirect routes (PMID40562756, PMID41319103, PMID39885359)." ], "strongest_contradictory_evidence": [ "These particular human mediators remain observational, and vaccine mechanisms are not resolved." ], "hsef_level_for_this_model": "Γ", "rationale": "AS01 cross-pathogen vaccine associations, terminal infection vascular differences and COVID biomarker shifts fit indirect routes (PMID40562756, PMID41319103, PMID39885359). These particular human mediators remain observational, and vaccine mechanisms are not resolved." }, { "rank_in_tournament": 3, "model_id": "M3", "is_nominal": false, "name": "Secondary entry after barrier/lesion changes", "core_claim": "Established pathology/barrier dysfunction permits microbial material to enter or persist.", "explains_what_nominal_does_not": "Established pathology/barrier dysfunction permits microbial material to enter or persist.", "strongest_supporting_evidence": [ "Late tissue and periodontitis-associated BBB disruption fit this ordering (PMID40684176, PMID39698934)." ], "strongest_contradictory_evidence": [ "Direct temporal human order is not measured and some imposed infections induce early pathology." ], "hsef_level_for_this_model": "Γ", "rationale": "Late tissue and periodontitis-associated BBB disruption fit this ordering (PMID40684176, PMID39698934). Direct temporal human order is not measured and some imposed infections induce early pathology." }, { "rank_in_tournament": 4, "model_id": "M5", "is_nominal": false, "name": "Bounded early infectious hit", "core_claim": "A specified pathogen at a specified early stage triggers a later autonomous cascade.", "explains_what_nominal_does_not": "A specified pathogen at a specified early stage triggers a later autonomous cascade.", "strongest_supporting_evidence": [ "Latency/reactivation and transient Chlamydia models show a testable possibility (PMID30870531, PMID39772530, PMID25538615)." ], "strongest_contradictory_evidence": [ "Requires antecedent records and fixed time window; unlimited pathogen/time substitution is unfalsifiable." ], "hsef_level_for_this_model": "Γ", "rationale": "Latency/reactivation and transient Chlamydia models show a testable possibility (PMID30870531, PMID39772530, PMID25538615). Requires antecedent records and fixed time window; unlimited pathogen/time substitution is unfalsifiable." }, { "rank_in_tournament": 5, "model_id": "M1", "is_nominal": true, "name": "Necessary CNS initiation in a substantial sporadic fraction", "core_claim": "A CNS pathogen is an indispensable initiating event for a prespecified human fraction.", "explains_what_nominal_does_not": "A CNS pathogen is an indispensable initiating event for a prespecified human fraction.", "strongest_supporting_evidence": [ "Positive tissue studies, induced infection, antecedent serology and vaccine causal contrasts are the strongest assembled case." ], "strongest_contradictory_evidence": [ "No necessary CNS mediator or attributable biomarker-confirmed AD fraction is established; assay replication and post-onset intervention failures remain material." ], "hsef_level_for_this_model": "Γ", "rationale": "Positive tissue studies, induced infection, antecedent serology and vaccine causal contrasts are the strongest assembled case. No necessary CNS mediator or attributable biomarker-confirmed AD fraction is established; assay replication and post-onset intervention failures remain material." } ], "tournament_summary": "Descriptive comparison; does not modify the nominal score. Serial validated CNS pathogen/viability assays, barrier markers and amyloid/tau trajectories before symptoms, with a selective exposure/removal instrument, distinguish obligatory early infection from risk modification or secondary entry. Pathogen and time window must be fixed in advance.", "study_separating_rank1_from_rank2": "Serial validated CNS pathogen/viability assays, barrier markers and amyloid/tau trajectories before symptoms, with a selective exposure/removal instrument, distinguish obligatory early infection from risk modification or secondary entry. Pathogen and time window must be fixed in advance.", "nominal_wins_only_by_funding_artifact": false, "level_unchanged_by_tournament": true }, "evidence_inventory": [ { "n": 1, "pmid": "9014911", "title": "Herpes simplex virus type 1 in brain and risk of Alzheimer's disease.", "citation": "Itzhaki RF, Lin WR, Shang D et al. Herpes simplex virus type 1 in brain and risk of Alzheimer's disease. Lancet (London, England). 1997.", "doi": "10.1016/S0140-6736(96)10149-5", "pmcid": "", "url": "https://pubmed.ncbi.nlm.nih.gov/9014911/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/9014911/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID9014911", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC2", "SC3" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": false, "endogenous": false, "direction": "supports", "what_it_shows": "Brain HSV detection interacted with APOE4 in a small autopsy case-control series.", "what_it_does_not_show": "HSV occurred in controls and some AD brains were negative; late tissue and wide intervals do not establish antecedent CNS necessity.", "confounders_present": [ "HSV occurred in controls and some AD brains were negative; late tissue and wide intervals do not establish antecedent CNS necessity." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 2, "pmid": "18973185", "title": "Herpes simplex virus type 1 DNA is located within Alzheimer's disease amyloid plaques.", "citation": "Wozniak MA, Mee AP, Itzhaki RF et al. Herpes simplex virus type 1 DNA is located within Alzheimer's disease amyloid plaques. The Journal of pathology. 2009.", "doi": "10.1002/path.2449", "pmcid": "", "url": "https://pubmed.ncbi.nlm.nih.gov/18973185/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/18973185/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID18973185", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC2" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": false, "endogenous": false, "direction": "supports", "what_it_shows": "In-situ PCR found plaque-associated HSV DNA in AD and aged normal brains, with different localization fractions.", "what_it_does_not_show": "Plaque colocalization cannot order infection before deposition or distinguish entrapment from initiation; small autopsy assay samples constrain scope.", "confounders_present": [ "Plaque colocalization cannot order infection before deposition or distinguish entrapment from initiation; small autopsy assay samples constrain scope." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 3, "pmid": "15602731", "title": "Productive herpes simplex virus in brain of elderly normal subjects and Alzheimer's disease patients.", "citation": "Wozniak MA, Shipley SJ, Combrinck M et al. Productive herpes simplex virus in brain of elderly normal subjects and Alzheimer's disease patients. Journal of medical virology. 2005.", "doi": "10.1002/jmv.20271", "pmcid": "", "url": "https://pubmed.ncbi.nlm.nih.gov/15602731/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/15602731/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID15602731", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC2", "SC3" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": true, "endogenous": false, "direction": "null", "what_it_shows": "Intrathecal HSV antibodies were frequent in both AD and controls without significant group difference.", "what_it_does_not_show": "Antibody indices imply prior intrathecal response rather than contemporary viable virus or disease-specific initiation; small sample limits negative inference.", "confounders_present": [ "Antibody indices imply prior intrathecal response rather than contemporary viable virus or disease-specific initiation; small sample limits negative inference." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 4, "pmid": "18982063", "title": "Seropositivity to herpes simplex virus antibodies and risk of Alzheimer's disease: a population-based cohort study.", "citation": "Letenneur L, Pérès K, Fleury H et al. Seropositivity to herpes simplex virus antibodies and risk of Alzheimer's disease: a population-based cohort study. PloS one. 2008.", "doi": "10.1371/journal.pone.0003637", "pmcid": "PMC2572852", "url": "https://pubmed.ncbi.nlm.nih.gov/18982063/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/18982063/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID18982063", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3", "SC4" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": false, "endogenous": false, "direction": "supports", "what_it_shows": "Baseline HSV IgM predicted incident AD in a fourteen-year dementia-free cohort; IgG did not significantly predict AD.", "what_it_does_not_show": "Peripheral IgM is not a CNS mediator and prediagnosis is not prelesion; measured confounding control does not isolate an initiating infection.", "confounders_present": [ "Peripheral IgM is not a CNS mediator and prediagnosis is not prelesion; measured confounding control does not isolate an initiating infection." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 5, "pmid": "25043910", "title": "Reactivated herpes simplex infection increases the risk of Alzheimer's disease.", "citation": "Lövheim H, Gilthorpe J, Adolfsson R et al. Reactivated herpes simplex infection increases the risk of Alzheimer's disease. Alzheimer's & dementia : the journal of the Alzheimer's Association. 2015.", "doi": "10.1016/j.jalz.2014.04.522", "pmcid": "", "url": "https://pubmed.ncbi.nlm.nih.gov/25043910/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/25043910/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID25043910", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3", "SC4" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": false, "endogenous": false, "direction": "supports", "what_it_shows": "Swedish baseline HSV IgM predicted later AD whereas IgG did not.", "what_it_does_not_show": "Age/sex-adjusted association and reactivation proxies cannot locate infection or demonstrate necessity; preclinical AD can precede sampling.", "confounders_present": [ "Age/sex-adjusted association and reactivation proxies cannot locate infection or demonstrate necessity; preclinical AD can precede sampling." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 6, "pmid": "31914220", "title": "Interaction between APOE4 and herpes simplex virus type 1 in Alzheimer's disease.", "citation": "Linard M, Letenneur L, Garrigue I et al. Interaction between APOE4 and herpes simplex virus type 1 in Alzheimer's disease. Alzheimer's & dementia : the journal of the Alzheimer's Association. 2020.", "doi": "10.1002/alz.12008", "pmcid": "", "url": "https://pubmed.ncbi.nlm.nih.gov/31914220/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/31914220/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID31914220", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3", "SC4" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": false, "endogenous": false, "direction": "supports", "what_it_shows": "Bordeaux-3C HSV antibody proxies associated with AD in APOE4 carriers but not noncarriers.", "what_it_does_not_show": "Wide genotype-stratum intervals and peripheral exposure do not verify a necessary CNS pathway; cohort estimates do not identify an etiologic fraction.", "confounders_present": [ "Wide genotype-stratum intervals and peripheral exposure do not verify a necessary CNS pathway; cohort estimates do not identify an etiologic fraction." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 7, "pmid": "33888766", "title": "Herpes simplex virus 1 and the risk of dementia: a population-based study.", "citation": "Murphy MJ, Fani L, Ikram MK et al. Herpes simplex virus 1 and the risk of dementia: a population-based study. Scientific reports. 2021.", "doi": "10.1038/s41598-021-87963-9", "pmcid": "PMC8062537", "url": "https://pubmed.ncbi.nlm.nih.gov/33888766/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/33888766/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID33888766", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3", "SC4" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": true, "endogenous": false, "direction": "null", "what_it_shows": "Rotterdam HSV IgG associated with cognitive decline but not incident dementia or AD.", "what_it_does_not_show": "IgG lifetime exposure is insensitive to reactivation and CNS infection; null incidence does not exclude a specific susceptibility subgroup.", "confounders_present": [ "IgG lifetime exposure is insensitive to reactivation and CNS infection; null incidence does not exclude a specific susceptibility subgroup." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 8, "pmid": "34560893", "title": "Herpesvirus infections and Alzheimer's disease: a Mendelian randomization study.", "citation": "Huang SY, Yang YX, Kuo K et al. Herpesvirus infections and Alzheimer's disease: a Mendelian randomization study. Alzheimer's research & therapy. 2021.", "doi": "10.1186/s13195-021-00905-5", "pmcid": "PMC8464096", "url": "https://pubmed.ncbi.nlm.nih.gov/34560893/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/34560893/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID34560893", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": true, "endogenous": false, "direction": "null", "what_it_shows": "Herpes-proxy Mendelian analyses gave heterogeneous results including positive mononucleosis and inverse shingles associations.", "what_it_does_not_show": "Exposure instruments and family-history validation do not represent CNS invasion; pleiotropy and limited power restrict pathogen-specific causal attribution.", "confounders_present": [ "Exposure instruments and family-history validation do not represent CNS invasion; pleiotropy and limited power restrict pathogen-specific causal attribution." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [ "IGAP and UK Biobank summary outcomes; multiple exposure tests are not independent AD cohorts." ] }, { "n": 9, "pmid": "29937276", "title": "Multiscale Analysis of Independent Alzheimer's Cohorts Finds Disruption of Molecular, Genetic, and Clinical Networks by Human Herpesvirus.", "citation": "Readhead B, Haure-Mirande JV, Funk CC et al. Multiscale Analysis of Independent Alzheimer's Cohorts Finds Disruption of Molecular, Genetic, and Clinical Networks by Human Herpesvirus. Neuron. 2018.", "doi": "10.1016/j.neuron.2018.05.023", "pmcid": "PMC6551233", "url": "https://pubmed.ncbi.nlm.nih.gov/29937276/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/29937276/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "AMPAD-MSBB-ROSMAP-Mayo", "access_depth": "full_text_partial", "access_note": "Complete primary abstract and linked-status metadata examined. Selected body sections: 3:STAR Methods:paragraph14, 3:STAR Methods:paragraph15, 3:STAR Methods:paragraph16, 3:STAR Methods:paragraph17, 3:STAR Methods:paragraph18, 3:STAR Methods:paragraph24, 3:STAR Methods:paragraph20, 3:STAR Methods:paragraph21, 3:STAR Methods:paragraph22, 3:STAR Methods:paragraph23. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC2", "SC3" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": false, "endogenous": false, "direction": "supports", "what_it_shows": "Multicohort postmortem network analysis reported HHV6A/7 enrichment and regulatory associations with APP pathways.", "what_it_does_not_show": "Original Methods use species-unique 31mers, sensitive local mapping and batch/cell covariates, yet independent reanalysis challenges assignment specificity. MSBB/ROSMAP shared archives and inherited integration complicate inference; modelled regulatory direction is not observed infection-before-AD.", "confounders_present": [ "Original Methods use species-unique 31mers, sensitive local mapping and batch/cell covariates, yet independent reanalysis challenges assignment specificity. MSBB/ROSMAP shared archives and inherited integration complicate inference; modelled regulatory direction is not observed infection-before-AD." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 10, "pmid": "31983538", "title": "Human Herpesvirus 6 Detection in Alzheimer's Disease Cases and Controls across Multiple Cohorts.", "citation": "Allnutt MA, Johnson K, Bennett DA et al. Human Herpesvirus 6 Detection in Alzheimer's Disease Cases and Controls across Multiple Cohorts. Neuron. 2020.", "doi": "10.1016/j.neuron.2019.12.031", "pmcid": "PMC7182308", "url": "https://pubmed.ncbi.nlm.nih.gov/31983538/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/31983538/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "AMPAD-MSBB-ROSMAP-plus-JHBRC", "access_depth": "full_text_partial", "access_note": "Complete primary abstract and linked-status metadata examined. Selected body sections: 1:Results::paragraph2, 1:Results::paragraph3, 1:Results::paragraph5, 3:STAR Methods::paragraph2, 3:STAR Methods::paragraph3. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC2" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": true, "endogenous": false, "direction": "null", "what_it_shows": "Independent sequence screening and HHV6 PCR across brain repositories found little AD specificity.", "what_it_does_not_show": "Original Methods/Results include PathSeq and triplex ddPCR, independent positive retesting and near-one-copy-per-cell integration patterns. MSBB/ROSMAP overlap positive reports; DNA assays add orthogonality but do not establish lifetime absence or a cleared early hit.", "confounders_present": [ "Original Methods/Results include PathSeq and triplex ddPCR, independent positive retesting and near-one-copy-per-cell integration patterns. MSBB/ROSMAP overlap positive reports; DNA assays add orthogonality but do not establish lifetime absence or a cleared early hit." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 11, "pmid": "32336252", "title": "Reanalysis of Alzheimer's brain sequencing data reveals absence of purported HHV6A and HHV7.", "citation": "Chorlton SD et al. Reanalysis of Alzheimer's brain sequencing data reveals absence of purported HHV6A and HHV7. Journal of bioinformatics and computational biology. 2020.", "doi": "10.1142/S0219720020500122", "pmcid": "", "url": "https://pubmed.ncbi.nlm.nih.gov/32336252/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/32336252/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "AMPAD-MSBB-reanalysis", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC2" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": true, "endogenous": false, "direction": "contradicts", "what_it_shows": "Alternative reanalysis failed to reproduce HHV7 reads and found HHV6A in few high-ranked original samples, identifying low-specificity mapping.", "what_it_does_not_show": "Same data are an assay-specific challenge rather than independent patients; negative reanalysis does not prove lifetime absence of infection.", "confounders_present": [ "Same data are an assay-specific challenge rather than independent patients; negative reanalysis does not prove lifetime absence of infection." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 12, "pmid": "26444787", "title": "Lack of evidence for a role of HHV-6 in the pathogenesis of Alzheimer's disease.", "citation": "Agostini S, Mancuso R, Baglio F et al. Lack of evidence for a role of HHV-6 in the pathogenesis of Alzheimer's disease. Journal of Alzheimer's disease : JAD. 2016.", "doi": "10.3233/JAD-150464", "pmcid": "", "url": "https://pubmed.ncbi.nlm.nih.gov/26444787/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/26444787/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID26444787", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC2", "SC3" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": true, "endogenous": false, "direction": "null", "what_it_shows": "HHV6 antibodies, avidity and regional volumes did not distinguish AD, aMCI and controls.", "what_it_does_not_show": "Serology does not detect localized CNS infection and cannot rule out every viral role despite the authors' stronger interpretation.", "confounders_present": [ "Serology does not detect localized CNS infection and cannot rule out every viral role despite the authors' stronger interpretation." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 13, "pmid": "9749980", "title": "Identification and localization of Chlamydia pneumoniae in the Alzheimer's brain.", "citation": "Balin BJ, Gérard HC, Arking EJ et al. Identification and localization of Chlamydia pneumoniae in the Alzheimer's brain. Medical microbiology and immunology. 1998.", "doi": "10.1007/s004300050071", "pmcid": "", "url": "https://pubmed.ncbi.nlm.nih.gov/9749980/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/9749980/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID9749980", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC2" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": false, "endogenous": false, "direction": "supports", "what_it_shows": "Chlamydia DNA, culture, transcripts and microscopy were positive in many AD brains versus controls.", "what_it_does_not_show": "Small late-autopsy series from one programme cannot order infection before lesions; independent failures of detection remain material.", "confounders_present": [ "Small late-autopsy series from one programme cannot order infection before lesions; independent failures of detection remain material." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 14, "pmid": "17052268", "title": "Chlamydophila (Chlamydia) pneumoniae in the Alzheimer's brain.", "citation": "Gérard HC, Dreses-Werringloer U, Wildt KS et al. Chlamydophila (Chlamydia) pneumoniae in the Alzheimer's brain. FEMS immunology and medical microbiology. 2006.", "doi": "10.1111/j.1574-695X.2006.00154.x", "pmcid": "", "url": "https://pubmed.ncbi.nlm.nih.gov/17052268/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/17052268/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID17052268", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC2" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": false, "endogenous": false, "direction": "supports", "what_it_shows": "Follow-up Chlamydia brain PCR and viable/transcriptional evidence extended the original positive programme.", "what_it_does_not_show": "The abstract reports inconsistent AD sample denominators; no precise prevalence is carried forward without body resolution. Shared programme is not independent causal replication.", "confounders_present": [ "The abstract reports inconsistent AD sample denominators; no precise prevalence is carried forward without body resolution. Shared programme is not independent causal replication." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 15, "pmid": "10655406", "title": "Failure to detect Chlamydia pneumoniae in brain sections of Alzheimer's disease patients.", "citation": "Gieffers J, Reusche E, Solbach W et al. Failure to detect Chlamydia pneumoniae in brain sections of Alzheimer's disease patients. Journal of clinical microbiology. 2000.", "doi": "10.1128/JCM.38.2.881-882.2000", "pmcid": "PMC86233", "url": "https://pubmed.ncbi.nlm.nih.gov/10655406/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/10655406/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID10655406", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC2" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": true, "endogenous": false, "direction": "null", "what_it_shows": "Nested PCR and immunostaining in twenty AD cases failed to detect Chlamydia.", "what_it_does_not_show": "Paraffin processing and limited tissue can reduce sensitivity; failure constrains common detectable presence, not every earlier exposure.", "confounders_present": [ "Paraffin processing and limited tissue can reduce sensitivity; failure constrains common detectable presence, not every earlier exposure." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 16, "pmid": "10878049", "title": "Failure to detect Chlamydia pneumoniae in the late-onset Alzheimer's brain.", "citation": "Ring RH, Lyons JM et al. Failure to detect Chlamydia pneumoniae in the late-onset Alzheimer's brain. Journal of clinical microbiology. 2000.", "doi": "10.1128/JCM.38.7.2591-2594.2000", "pmcid": "PMC86976", "url": "https://pubmed.ncbi.nlm.nih.gov/10878049/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/10878049/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID10878049", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC2" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": true, "endogenous": false, "direction": "null", "what_it_shows": "Repeated PCR across up to six regions and culture failed unequivocal Chlamydia detection in AD/control brains.", "what_it_does_not_show": "Fifteen cases and five controls are small; validated negative contemporary tissue does not test a prespecified cleared early-hit model.", "confounders_present": [ "Fifteen cases and five controls are small; validated negative contemporary tissue does not test a prespecified cleared early-hit model." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 17, "pmid": "23666172", "title": "Determining the presence of periodontopathic virulence factors in short-term postmortem Alzheimer's disease brain tissue.", "citation": "Poole S, Singhrao SK, Kesavalu L et al. Determining the presence of periodontopathic virulence factors in short-term postmortem Alzheimer's disease brain tissue. Journal of Alzheimer's disease : JAD. 2013.", "doi": "10.3233/JAD-121918", "pmcid": "", "url": "https://pubmed.ncbi.nlm.nih.gov/23666172/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/23666172/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID23666172", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC2" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": false, "endogenous": false, "direction": "supports", "what_it_shows": "Periodontal LPS immunostaining/immunoblotting identified four of ten AD brains and no controls.", "what_it_does_not_show": "A virulence component is not proof of live CNS infection or entry before AD; surface adsorption and small tissue samples constrain specificity.", "confounders_present": [ "A virulence component is not proof of live CNS infection or entry before AD; surface adsorption and small tissue samples constrain specificity." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 18, "pmid": "22546352", "title": "Serum antibodies to periodontal pathogens are a risk factor for Alzheimer's disease.", "citation": "Sparks Stein P, Steffen MJ, Smith C et al. Serum antibodies to periodontal pathogens are a risk factor for Alzheimer's disease. Alzheimer's & dementia : the journal of the Alzheimer's Association. 2012.", "doi": "10.1016/j.jalz.2011.04.006", "pmcid": "PMC3712346", "url": "https://pubmed.ncbi.nlm.nih.gov/22546352/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/22546352/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID22546352", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3", "SC4" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": false, "endogenous": false, "direction": "supports", "what_it_shows": "Periodontal antibody differences preceded cognitive conversion in the Kentucky cohort.", "what_it_does_not_show": "The significant taxa were Fusobacterium and Prevotella, not a uniquely demonstrated Pg CNS infection; antibody and oral-health confounding remain.", "confounders_present": [ "The significant taxa were Fusobacterium and Prevotella, not a uniquely demonstrated Pg CNS infection; antibody and oral-health confounding remain." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [ "Kentucky BRANS stored serum; not a selective CNS mediator instrument." ] }, { "n": 19, "pmid": "32280099", "title": "Clinical and Bacterial Markers of Periodontitis and Their Association with Incident All-Cause and Alzheimer's Disease Dementia in a Large National Survey.", "citation": "Beydoun MA, Beydoun HA, Hossain S et al. Clinical and Bacterial Markers of Periodontitis and Their Association with Incident All-Cause and Alzheimer's Disease Dementia in a Large National Survey. Journal of Alzheimer's disease : JAD. 2020.", "doi": "10.3233/JAD-200064", "pmcid": "PMC11008556", "url": "https://pubmed.ncbi.nlm.nih.gov/32280099/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/32280099/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID32280099", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3", "SC4" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": false, "endogenous": false, "direction": "supports", "what_it_shows": "NHANES periodontal depth and multi-taxon antibody composites associated with later claims-based dementia and AD outcomes.", "what_it_does_not_show": "Composite exposures, socioeconomic care and claims diagnosis cannot identify a necessary CNS species or fraction.", "confounders_present": [ "Composite exposures, socioeconomic care and claims diagnosis cannot identify a necessary CNS species or fraction." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 20, "pmid": "11929559", "title": "Molecular and immunological evidence of oral Treponema in the human brain and their association with Alzheimer's disease.", "citation": "Riviere GR, Riviere KH, Smith KS et al. Molecular and immunological evidence of oral Treponema in the human brain and their association with Alzheimer's disease. Oral microbiology and immunology. 2002.", "doi": "10.1046/j.0902-0055.2001.00100.x", "pmcid": "", "url": "https://pubmed.ncbi.nlm.nih.gov/11929559/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/11929559/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID11929559", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC2" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": false, "endogenous": false, "direction": "supports", "what_it_shows": "Oral Treponema PCR and antigens were enriched in AD cortex and detected in some controls and trigeminal tissue.", "what_it_does_not_show": "Cross-sectional localization is compatible with several entry directions; late presence does not prove initiating necessity.", "confounders_present": [ "Cross-sectional localization is compatible with several entry directions; late presence does not prove initiating necessity." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 21, "pmid": "9766207", "title": "Arguments against the involvement of Borrelia burgdorferi sensu lato in Alzheimer's disease.", "citation": "Gutacker M, Valsangiacomo C, Balmelli T et al. Arguments against the involvement of Borrelia burgdorferi sensu lato in Alzheimer's disease. Research in microbiology. 1998.", "doi": "10.1016/s0923-2508(97)83621-2", "pmcid": "", "url": "https://pubmed.ncbi.nlm.nih.gov/9766207/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/9766207/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID9766207", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC2" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": true, "endogenous": false, "direction": "null", "what_it_shows": "Multiple-target PCR and serology failed to support Borrelia involvement in examined AD samples.", "what_it_does_not_show": "Small brain series cannot exclude every pathogen or cleared early exposure; this constrains the specific Borrelia claim.", "confounders_present": [ "Small brain series cannot exclude every pathogen or cleared early exposure; this constrains the specific Borrelia claim." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 22, "pmid": "26468932", "title": "Different Brain Regions are Infected with Fungi in Alzheimer's Disease.", "citation": "Pisa D, Alonso R, Rábano A et al. Different Brain Regions are Infected with Fungi in Alzheimer's Disease. Scientific reports. 2015.", "doi": "10.1038/srep15015", "pmcid": "PMC4606562", "url": "https://pubmed.ncbi.nlm.nih.gov/26468932/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/26468932/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID26468932", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC2" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": false, "endogenous": false, "direction": "supports", "what_it_shows": "Fungal staining and sequencing reported multiple fungal species in AD CNS regions versus controls.", "what_it_does_not_show": "Low-biomass tissue, antibody cross-reactivity, reagent contamination and late entry need independent resolution; reported material is not antecedent necessity.", "confounders_present": [ "Low-biomass tissue, antibody cross-reactivity, reagent contamination and late entry need independent resolution; reported material is not antecedent necessity." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 23, "pmid": "39698934", "title": "Alzheimer's disease-associated CD83(+) microglia are linked with increased immunoglobulin G4 and human cytomegalovirus in the gut, vagal nerve, and brain.", "citation": "Readhead BP, Mastroeni DF, Wang Q et al. Alzheimer's disease-associated CD83(+) microglia are linked with increased immunoglobulin G4 and human cytomegalovirus in the gut, vagal nerve, and brain. Alzheimer's & dementia : the journal of the Alzheimer's Association. 2025.", "doi": "10.1002/alz.14401", "pmcid": "PMC11772737", "url": "https://pubmed.ncbi.nlm.nih.gov/39698934/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/39698934/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID39698934", "access_depth": "full_text_partial", "access_note": "Complete primary abstract and linked-status metadata examined. Selected body sections: 1:METHODS:paragraph13, 1:METHODS:paragraph14, 1:METHODS:paragraph9, 1:METHODS:paragraph12, 1:METHODS:paragraph29, 2:RESULTS:paragraph0, 2:RESULTS:paragraph1. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC2", "SC3" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": false, "endogenous": false, "direction": "supports", "what_it_shows": "CD83 microglia, HCMV and IgG4 cross-tissue associations were replicated, and infected organoids showed AD-like changes.", "what_it_does_not_show": "Original Methods identify selected 34 cortical, 25 colon and eight vagal Banner specimens, plus an AD-only ROSMAP validation subset; antibody peptide/positive-negative tissue controls are present. Organoid experiments use dissociated cells with imposed HCMV and 48-hour assays. Cross-tissue direction, viable human CNS infection and initiation remain unproved.", "confounders_present": [ "Original Methods identify selected 34 cortical, 25 colon and eight vagal Banner specimens, plus an AD-only ROSMAP validation subset; antibody peptide/positive-negative tissue controls are present. Organoid experiments use dissociated cells with imposed HCMV and 48-hour assays. Cross-tissue direction, viable human CNS infection and initiation remain unproved." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [ "Banner/AZSAND selected tissues and ROSMAP validation can overlap other archive-based AD reports." ] }, { "n": 24, "pmid": "40175543", "title": "A natural experiment on the effect of herpes zoster vaccination on dementia.", "citation": "Eyting M, Xie M, Michalik F et al. A natural experiment on the effect of herpes zoster vaccination on dementia. Nature. 2025.", "doi": "10.1038/s41586-025-08800-x", "pmcid": "PMC12058522", "url": "https://pubmed.ncbi.nlm.nih.gov/40175543/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/40175543/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "UpdateOf: PMID37292746" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "Welsh-zoster-eligibility", "access_depth": "full_text_partial", "access_note": "Complete primary abstract and linked-status metadata examined. Selected body sections: 6:Explorations of the effect mechanism:paragraph0, 6:Explorations of the effect mechanism:paragraph12, 8:Methods:paragraph8, 8:Methods:paragraph11, 8:Methods:paragraph12. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3" ], "favors_models": [], "evidence_class": "Strong", "system": "natural experiment", "decisive_perturbation": true, "endogenous": true, "direction": "supports", "what_it_shows": "Welsh birth-date eligibility discontinuity supported reduced or delayed dementia diagnosis after live zoster vaccination.", "what_it_does_not_show": "Original Methods define dementia of any cause, distinguish eligibility from instrument-scaled complier receipt effects, and consider clinical/subclinical VZV and pathogen-independent immune effects as compatible exploratory mechanisms. No CNS-pathogen-mediated biomarker-confirmed AD fraction is estimated.", "confounders_present": [ "Original Methods define dementia of any cause, distinguish eligibility from instrument-scaled complier receipt effects, and consider clinical/subclinical VZV and pathogen-independent immune effects as compatible exploratory mechanisms. No CNS-pathogen-mediated biomarker-confirmed AD fraction is estimated." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 25, "pmid": "40267506", "title": "Herpes Zoster Vaccination and Dementia Occurrence.", "citation": "Pomirchy M, Bommer C, Pradella F et al. Herpes Zoster Vaccination and Dementia Occurrence. JAMA. 2025.", "doi": "10.1001/jama.2025.5013", "pmcid": "PMC12019675", "url": "https://pubmed.ncbi.nlm.nih.gov/40267506/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/40267506/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "UpdateOf: PMID38978672" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID40267506", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3" ], "favors_models": [], "evidence_class": "Strong", "system": "natural experiment", "decisive_perturbation": true, "endogenous": true, "direction": "supports", "what_it_shows": "Australian birth-date vaccine eligibility reduced recorded dementia diagnoses with balanced baseline health and preventive-care controls.", "what_it_does_not_show": "The eligibility effect is not the receipt effect; primary-care diagnoses lack AD/CNS mediation and the local age threshold limits transfer.", "confounders_present": [ "The eligibility effect is not the receipt effect; primary-care diagnoses lack AD/CNS mediation and the local age threshold limits transfer." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 26, "pmid": "41579903", "title": "Herpes zoster vaccination and incident dementia in Canada: an analysis of natural experiments.", "citation": "Pomirchy M, Chung S, Bommer C et al. Herpes zoster vaccination and incident dementia in Canada: an analysis of natural experiments. The Lancet. Neurology. 2026.", "doi": "10.1016/S1474-4422(25)00455-7", "pmcid": "PMC13101831", "url": "https://pubmed.ncbi.nlm.nih.gov/41579903/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/41579903/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID41579903", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3" ], "favors_models": [], "evidence_class": "Strong", "system": "natural experiment", "decisive_perturbation": true, "endogenous": true, "direction": "supports", "what_it_shows": "Canadian eligibility discontinuities and cross-province comparisons supported delayed/reduced dementia diagnoses after live zoster vaccination.", "what_it_does_not_show": "Multiple analyses share a Canadian source population; exposure uptake is separately surveyed and mechanism remains unspecified.", "confounders_present": [ "Multiple analyses share a Canadian source population; exposure uptake is separately surveyed and mechanism remains unspecified." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 27, "pmid": "41338191", "title": "The effect of shingles vaccination at different stages of the dementia disease course.", "citation": "Xie M, Eyting M, Bommer C et al. The effect of shingles vaccination at different stages of the dementia disease course. Cell. 2025.", "doi": "10.1016/j.cell.2025.11.007", "pmcid": "PMC12851904", "url": "https://pubmed.ncbi.nlm.nih.gov/41338191/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/41338191/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "Welsh-zoster-eligibility", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3" ], "favors_models": [], "evidence_class": "Strong", "system": "natural experiment", "decisive_perturbation": true, "endogenous": true, "direction": "supports", "what_it_shows": "Welsh eligibility analysis found effects on MCI diagnoses and dementia-related deaths after diagnosis.", "what_it_does_not_show": "Same Welsh programme as prior report; nonspecific dementia effects and postdiagnosis benefit are incompatible with assuming only an initiation pathway.", "confounders_present": [ "Same Welsh programme as prior report; nonspecific dementia effects and postdiagnosis benefit are incompatible with assuming only an initiation pathway." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 28, "pmid": "39053634", "title": "The recombinant shingles vaccine is associated with lower risk of dementia.", "citation": "Taquet M, Dercon Q, Todd JA et al. The recombinant shingles vaccine is associated with lower risk of dementia. Nature medicine. 2024.", "doi": "10.1038/s41591-024-03201-5", "pmcid": "PMC11485228", "url": "https://pubmed.ncbi.nlm.nih.gov/39053634/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/39053634/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "US-TriNetX-vaccine-programme", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3" ], "favors_models": [], "evidence_class": "Moderate", "system": "natural experiment", "decisive_perturbation": true, "endogenous": true, "direction": "supports", "what_it_shows": "The US vaccine transition comparison associated recombinant vaccination with greater dementia-diagnosis-free time than live vaccination.", "what_it_does_not_show": "Time-period/formulation changes and residual care differences remain; diagnosis-free time is not an incidence-risk percentage or direct CNS mediator.", "confounders_present": [ "Time-period/formulation changes and residual care differences remain; diagnosis-free time is not an incidence-risk percentage or direct CNS mediator." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 29, "pmid": "40562756", "title": "Lower risk of dementia with AS01-adjuvanted vaccination against shingles and respiratory syncytial virus infections.", "citation": "Taquet M, Todd JA, Harrison PJ et al. Lower risk of dementia with AS01-adjuvanted vaccination against shingles and respiratory syncytial virus infections. NPJ vaccines. 2025.", "doi": "10.1038/s41541-025-01172-3", "pmcid": "PMC12198376", "url": "https://pubmed.ncbi.nlm.nih.gov/40562756/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/40562756/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "US-TriNetX-vaccine-programme", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": true, "endogenous": false, "direction": "supports", "what_it_shows": "AS01-adjuvanted zoster and RSV vaccines associated similarly with lower short-term dementia risk.", "what_it_does_not_show": "Propensity matching does not prove an adjuvant mechanism; different pathogens and short latency challenge unique CNS-infection attribution.", "confounders_present": [ "Propensity matching does not prove an adjuvant mechanism; different pathogens and short latency challenge unique CNS-infection attribution." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 30, "pmid": "39733478", "title": "Recombinant zoster vaccine and the risk of dementia.", "citation": "Tang E, Ray I, Arnold BF et al. Recombinant zoster vaccine and the risk of dementia. Vaccine. 2025.", "doi": "10.1016/j.vaccine.2024.126673", "pmcid": "PMC11969937", "url": "https://pubmed.ncbi.nlm.nih.gov/39733478/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/39733478/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID39733478", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": false, "endogenous": false, "direction": "supports", "what_it_shows": "Large claims cohorts associated recombinant vaccine dose and antiviral exposure with lower dementia incidence.", "what_it_does_not_show": "Healthy-user, treatment indication and diagnostic bias remain; no biomarker-defined AD or CNS infection mediates the reported association.", "confounders_present": [ "Healthy-user, treatment indication and diagnostic bias remain; no biomarker-defined AD or CNS infection mediates the reported association." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 31, "pmid": "41405855", "title": "Valacyclovir Treatment of Early Symptomatic Alzheimer Disease: The VALAD Randomized Clinical Trial.", "citation": "Devanand DP, Wisniewski T, Razlighi Q et al. Valacyclovir Treatment of Early Symptomatic Alzheimer Disease: The VALAD Randomized Clinical Trial. JAMA. 2026.", "doi": "10.1001/jama.2025.21738", "pmcid": "PMC12712832", "url": "https://pubmed.ncbi.nlm.nih.gov/41405855/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/41405855/", "tier": "A", "source_tier": "A", "kind": "rct", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID41405855", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3" ], "favors_models": [], "evidence_class": "Strong", "system": "human interventional", "decisive_perturbation": true, "endogenous": true, "direction": "contradicts", "what_it_shows": "VALAD valacyclovir worsened the primary cognitive outcome versus placebo and did not improve amyloid/tau PET in early symptomatic HSV-seropositive disease.", "what_it_does_not_show": "Serology does not demonstrate CNS active replication; post-onset failure constrains this treatment/model, not a precisely specified cleared early initiating hit.", "confounders_present": [ "Serology does not demonstrate CNS active replication; post-onset failure constrains this treatment/model, not a precisely specified cleared early initiating hit." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 32, "pmid": "42210804", "title": "Valacyclovir Treatment in Mild Cognitive Impairment: The VALMCI Randomized Clinical Trial.", "citation": "Devanand DP, Huey ED, Qian M et al. Valacyclovir Treatment in Mild Cognitive Impairment: The VALMCI Randomized Clinical Trial. Alzheimer disease and associated disorders. 2026 Apr-Jun 01.", "doi": "10.1097/WAD.0000000000000735", "pmcid": "", "url": "https://pubmed.ncbi.nlm.nih.gov/42210804/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/42210804/", "tier": "A", "source_tier": "A", "kind": "rct", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID42210804", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3" ], "favors_models": [], "evidence_class": "Strong", "system": "human interventional", "decisive_perturbation": true, "endogenous": true, "direction": "null", "what_it_shows": "VALMCI found no amyloid-PET, cognitive or functional benefit over twelve months in amyloid-positive HSV-seropositive MCI.", "what_it_does_not_show": "Small pilot intervals admit limited effects; MCI with established amyloid is not prelesion prevention and active CNS infection was not the selection gate.", "confounders_present": [ "Small pilot intervals admit limited effects; MCI with established amyloid is not prelesion prevention and active CNS infection was not the selection gate." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 33, "pmid": "35310522", "title": "VALZ-Pilot: High-dose valacyclovir treatment in patients with early-stage Alzheimer's disease.", "citation": "Weidung B, Hemmingsson ES, Olsson J et al. VALZ-Pilot: High-dose valacyclovir treatment in patients with early-stage Alzheimer's disease. Alzheimer's & dementia (New York, N. Y.). 2022.", "doi": "10.1002/trc2.12264", "pmcid": "PMC8919248", "url": "https://pubmed.ncbi.nlm.nih.gov/35310522/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/35310522/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID35310522", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3" ], "favors_models": [], "evidence_class": "Moderate", "system": "human interventional", "decisive_perturbation": false, "endogenous": true, "direction": "supports", "what_it_shows": "Open VALZ pilot established short-term valacyclovir feasibility and CSF drug exposure with unchanged tau/NfL and improved MMSE.", "what_it_does_not_show": "Uncontrolled four-week change is vulnerable to practice effects; CNS drug exposure is not measured viral suppression or disease modification.", "confounders_present": [ "Uncontrolled four-week change is vulnerable to practice effects; CNS drug exposure is not measured viral suppression or disease modification." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 34, "pmid": "14962152", "title": "A randomized, controlled trial of doxycycline and rifampin for patients with Alzheimer's disease.", "citation": "Loeb MB, Molloy DW, Smieja M et al. A randomized, controlled trial of doxycycline and rifampin for patients with Alzheimer's disease. Journal of the American Geriatrics Society. 2004.", "doi": "10.1111/j.1532-5415.2004.52109.x", "pmcid": "", "url": "https://pubmed.ncbi.nlm.nih.gov/14962152/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/14962152/", "tier": "A", "source_tier": "A", "kind": "rct", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID14962152", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3" ], "favors_models": [], "evidence_class": "Strong", "system": "human interventional", "decisive_perturbation": true, "endogenous": true, "direction": "supports", "what_it_shows": "Antibiotic combination reduced six-month cognitive decline in a small randomized trial but not significantly at twelve months.", "what_it_does_not_show": "Chlamydia tests did not change, and antibiotics have non-antimicrobial effects; clinical signal does not isolate CNS infection initiation.", "confounders_present": [ "Chlamydia tests did not change, and antibiotics have non-antimicrobial effects; clinical signal does not isolate CNS infection initiation." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 35, "pmid": "22718435", "title": "A multicenter, blinded, randomized, factorial controlled trial of doxycycline and rifampin for treatment of Alzheimer's disease: the DARAD trial.", "citation": "Molloy DW, Standish TI, Zhou Q et al. A multicenter, blinded, randomized, factorial controlled trial of doxycycline and rifampin for treatment of Alzheimer's disease: the DARAD trial. International journal of geriatric psychiatry. 2013.", "doi": "10.1002/gps.3846", "pmcid": "", "url": "https://pubmed.ncbi.nlm.nih.gov/22718435/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/22718435/", "tier": "A", "source_tier": "A", "kind": "rct", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID22718435", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3" ], "favors_models": [], "evidence_class": "Strong", "system": "human interventional", "decisive_perturbation": true, "endogenous": true, "direction": "null", "what_it_shows": "DARAD failed cognitive/functional benefit from doxycycline/rifampin and showed deterioration with individual agents.", "what_it_does_not_show": "Post-onset treatment and pathogen-unselected participants limit etiologic inference; does not exclude a prespecified earlier infection event.", "confounders_present": [ "Post-onset treatment and pathogen-unselected participants limit etiologic inference; does not exclude a prespecified earlier infection event." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 36, "pmid": "29488144", "title": "Anti-herpetic Medications and Reduced Risk of Dementia in Patients with Herpes Simplex Virus Infections-a Nationwide, Population-Based Cohort Study in Taiwan.", "citation": "Tzeng NS, Chung CH, Lin FH et al. Anti-herpetic Medications and Reduced Risk of Dementia in Patients with Herpes Simplex Virus Infections-a Nationwide, Population-Based Cohort Study in Taiwan. Neurotherapeutics : the journal of the American Society for Experimental NeuroTherapeutics. 2018.", "doi": "10.1007/s13311-018-0611-x", "pmcid": "PMC5935641", "url": "https://pubmed.ncbi.nlm.nih.gov/29488144/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/29488144/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID29488144", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": false, "endogenous": false, "direction": "supports", "what_it_shows": "Taiwan claims associated clinically diagnosed HSV with dementia and antiviral prescriptions with a very large lower hazard.", "what_it_does_not_show": "Indication, care access, time assignment and diagnosis biases can distort large effects; neither CNS infection nor AD biomarkers were the endpoint.", "confounders_present": [ "Indication, care access, time assignment and diagnosis biases can distort large effects; neither CNS infection nor AD biomarkers were the endpoint." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 37, "pmid": "42297456", "title": "Association between the use of anti-herpetic drugs and subsequent initiation of Alzheimer's disease drug treatment: Dutch population-based inception cohort study.", "citation": "Alghamdi A, Balafas S, Bos JHJ et al. Association between the use of anti-herpetic drugs and subsequent initiation of Alzheimer's disease drug treatment: Dutch population-based inception cohort study. BMJ open. 2026.", "doi": "10.1136/bmjopen-2025-114033", "pmcid": "PMC13289104", "url": "https://pubmed.ncbi.nlm.nih.gov/42297456/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/42297456/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID42297456", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": false, "endogenous": false, "direction": "supports", "what_it_shows": "Dutch pharmacy exposure associated antivirals with markedly lower subsequent AD-drug initiation.", "what_it_does_not_show": "Medication initiation is not confirmed AD incidence; unmeasured indication, time and care-selection bias remain, and no CNS mediator was measured.", "confounders_present": [ "Medication initiation is not confirmed AD incidence; unmeasured indication, time and care-selection bias remain, and no CNS mediator was measured." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 38, "pmid": "17980964", "title": "Herpes simplex virus infection causes cellular beta-amyloid accumulation and secretase upregulation.", "citation": "Wozniak MA, Itzhaki RF, Shipley SJ et al. Herpes simplex virus infection causes cellular beta-amyloid accumulation and secretase upregulation. Neuroscience letters. 2007.", "doi": "10.1016/j.neulet.2007.09.077", "pmcid": "", "url": "https://pubmed.ncbi.nlm.nih.gov/17980964/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/17980964/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID17980964", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC1", "SC3" ], "favors_models": [], "evidence_class": "Moderate", "system": "animal experimental", "decisive_perturbation": false, "endogenous": false, "direction": "supports", "what_it_shows": "Imposed HSV infection increased cellular secretases/Aβ and brain Aβ deposits.", "what_it_does_not_show": "Induced infection establishes capability, not native sporadic initiation, selective vulnerability or an etiologic human fraction.", "confounders_present": [ "Induced infection establishes capability, not native sporadic initiation, selective vulnerability or an etiologic human fraction." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 39, "pmid": "19221424", "title": "Alzheimer's disease-specific tau phosphorylation is induced by herpes simplex virus type 1.", "citation": "Wozniak MA, Frost AL, Itzhaki RF et al. Alzheimer's disease-specific tau phosphorylation is induced by herpes simplex virus type 1. Journal of Alzheimer's disease : JAD. 2009.", "doi": "10.3233/JAD-2009-0963", "pmcid": "", "url": "https://pubmed.ncbi.nlm.nih.gov/19221424/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/19221424/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID19221424", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3" ], "favors_models": [], "evidence_class": "Moderate", "system": "cell experimental", "decisive_perturbation": false, "endogenous": false, "direction": "supports", "what_it_shows": "HSV infection induced AD-associated tau phosphorylation and kinase activity in cells.", "what_it_does_not_show": "AD-like epitopes under acute infection are not complete human AD causality or necessary initiating infection.", "confounders_present": [ "AD-like epitopes under acute infection are not complete human AD causality or necessary initiating infection." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 40, "pmid": "22003387", "title": "Antivirals reduce the formation of key Alzheimer's disease molecules in cell cultures acutely infected with herpes simplex virus type 1.", "citation": "Wozniak MA, Frost AL, Preston CM et al. Antivirals reduce the formation of key Alzheimer's disease molecules in cell cultures acutely infected with herpes simplex virus type 1. PloS one. 2011.", "doi": "10.1371/journal.pone.0025152", "pmcid": "PMC3189195", "url": "https://pubmed.ncbi.nlm.nih.gov/22003387/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/22003387/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID22003387", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC1", "SC3" ], "favors_models": [], "evidence_class": "Strong", "system": "cell experimental", "decisive_perturbation": true, "endogenous": false, "direction": "supports", "what_it_shows": "Replication-restricted viral strains and antivirals separated infection stages producing Aβ and phosphorylated tau.", "what_it_does_not_show": "Aβ and tau had different replication dependencies; acute culture rescue cannot substitute for disease modification, as later human trials demonstrate.", "confounders_present": [ "Aβ and tau had different replication dependencies; acute culture rescue cannot substitute for disease modification, as later human trials demonstrate." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 41, "pmid": "30870531", "title": "Recurrent herpes simplex virus-1 infection induces hallmarks of neurodegeneration and cognitive deficits in mice.", "citation": "De Chiara G, Piacentini R, Fabiani M et al. Recurrent herpes simplex virus-1 infection induces hallmarks of neurodegeneration and cognitive deficits in mice. PLoS pathogens. 2019.", "doi": "10.1371/journal.ppat.1007617", "pmcid": "PMC6417650", "url": "https://pubmed.ncbi.nlm.nih.gov/30870531/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/30870531/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID30870531", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3", "SC4" ], "favors_models": [], "evidence_class": "Moderate", "system": "animal experimental", "decisive_perturbation": true, "endogenous": false, "direction": "supports", "what_it_shows": "Repeated thermal reactivation of imposed HSV produced CNS replication, accumulated pathology and persistent cognitive deficits.", "what_it_does_not_show": "Combined infection/stress and induced cycles do not demonstrate naturally initiated sporadic human AD or a necessity fraction.", "confounders_present": [ "Combined infection/stress and induced cycles do not demonstrate naturally initiated sporadic human AD or a necessity fraction." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 42, "pmid": "32494701", "title": "A 3D human brain-like tissue model of herpes-induced Alzheimer's disease.", "citation": "Cairns DM, Rouleau N, Parker RN et al. A 3D human brain-like tissue model of herpes-induced Alzheimer's disease. Science advances. 2020.", "doi": "10.1126/sciadv.aay8828", "pmcid": "PMC7202879", "url": "https://pubmed.ncbi.nlm.nih.gov/32494701/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/32494701/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID32494701", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC1", "SC3" ], "favors_models": [], "evidence_class": "Moderate", "system": "cell experimental", "decisive_perturbation": false, "endogenous": false, "direction": "supports", "what_it_shows": "Imposed HSV in engineered human neural tissue produced plaque-like formations, inflammation and reduced function without added Aβ.", "what_it_does_not_show": "Exogenous virus remains an imposed trigger; immature tissue and injury responses do not establish a human etiologic fraction.", "confounders_present": [ "Exogenous virus remains an imposed trigger; immature tissue and injury responses do not establish a human etiologic fraction." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 43, "pmid": "35754275", "title": "Potential Involvement of Varicella Zoster Virus in Alzheimer's Disease via Reactivation of Quiescent Herpes Simplex Virus Type 1.", "citation": "Cairns DM, Itzhaki RF, Kaplan DL et al. Potential Involvement of Varicella Zoster Virus in Alzheimer's Disease via Reactivation of Quiescent Herpes Simplex Virus Type 1. Journal of Alzheimer's disease : JAD. 2022.", "doi": "10.3233/JAD-220287", "pmcid": "", "url": "https://pubmed.ncbi.nlm.nih.gov/35754275/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/35754275/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID35754275", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3" ], "favors_models": [], "evidence_class": "Moderate", "system": "cell experimental", "decisive_perturbation": true, "endogenous": false, "direction": "supports", "what_it_shows": "VZV alone induced inflammation without Aβ/tau but reactivated latent HSV with AD-like changes.", "what_it_does_not_show": "Culture-specific reactivation supports an indirect possibility, not proven CNS VZV/HSV mediation of vaccination effects.", "confounders_present": [ "Culture-specific reactivation supports an indirect possibility, not proven CNS VZV/HSV mediation of vaccination effects." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 44, "pmid": "39772530", "title": "Repetitive injury induces phenotypes associated with Alzheimer's disease by reactivating HSV-1 in a human brain tissue model.", "citation": "Cairns DM, Smiley BM, Smiley JA et al. Repetitive injury induces phenotypes associated with Alzheimer's disease by reactivating HSV-1 in a human brain tissue model. Science signaling. 2025.", "doi": "10.1126/scisignal.ado6430", "pmcid": "", "url": "https://pubmed.ncbi.nlm.nih.gov/39772530/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/39772530/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID39772530", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3", "SC4" ], "favors_models": [], "evidence_class": "Strong", "system": "cell experimental", "decisive_perturbation": true, "endogenous": false, "direction": "supports", "what_it_shows": "Controlled injury reactivated latent HSV and increased AD-like changes; mock infection and IL1beta blockade separated contributing pathways.", "what_it_does_not_show": "The initiating event in this model includes injury and imposed latent virus; pathway blockade in monolayers does not establish native human CNS necessity.", "confounders_present": [ "The initiating event in this model includes injury and imposed latent virus; pathway blockade in monolayers does not establish native human CNS necessity." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [ "Related hiNSC/silk brain-tissue platform to 32494701 and 35754275." ] }, { "n": 45, "pmid": "39753133", "title": "Anti-herpetic tau preserves neurons via the cGAS-STING-TBK1 pathway in Alzheimer's disease.", "citation": "Hyde VR, Zhou C, Fernandez JR et al. Anti-herpetic tau preserves neurons via the cGAS-STING-TBK1 pathway in Alzheimer's disease. Cell reports. 2025.", "doi": "10.1016/j.celrep.2024.115109", "pmcid": "", "url": "https://pubmed.ncbi.nlm.nih.gov/39753133/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/39753133/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID39753133", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC1", "SC2" ], "favors_models": [], "evidence_class": "Strong", "system": "cell experimental", "decisive_perturbation": true, "endogenous": false, "direction": "supports", "what_it_shows": "Human HSV-associated proteins and organoid cGAS-STING-TBK1 perturbations linked phosphorylation with protection against infected-neuron death.", "what_it_does_not_show": "Protective acute p-tau response is not beneficial chronic tangle deposition; postmortem association and induced infection do not order AD initiation.", "confounders_present": [ "Protective acute p-tau response is not beneficial chronic tangle deposition; postmortem association and induced infection do not order AD initiation." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 46, "pmid": "33268524", "title": "Modeling Aβ42 Accumulation in Response to Herpes Simplex Virus 1 Infection: 2D or 3D?", "citation": "Abrahamson EE, Zheng W, Muralidaran V et al. Modeling Aβ42 Accumulation in Response to Herpes Simplex Virus 1 Infection: 2D or 3D? Journal of virology. 2021.", "doi": "10.1128/JVI.02219-20", "pmcid": "PMC8092822", "url": "https://pubmed.ncbi.nlm.nih.gov/33268524/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/33268524/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID33268524", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC1", "SC3" ], "favors_models": [], "evidence_class": "Moderate", "system": "cell experimental", "decisive_perturbation": true, "endogenous": false, "direction": "supports", "what_it_shows": "HSV-associated Aβ localization differed between 2D infected cells and 3D surrounding cells.", "what_it_does_not_show": "Architecture-dependent induction is not uniform direct viral amyloid seeding; developmental organoids cannot establish clinical necessity.", "confounders_present": [ "Architecture-dependent induction is not uniform direct viral amyloid seeding; developmental organoids cannot establish clinical necessity." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 47, "pmid": "31831060", "title": "HHV-6A infection induces amyloid-beta expression and activation of microglial cells.", "citation": "Bortolotti D, Gentili V, Rotola A et al. HHV-6A infection induces amyloid-beta expression and activation of microglial cells. Alzheimer's research & therapy. 2019.", "doi": "10.1186/s13195-019-0552-6", "pmcid": "PMC6909659", "url": "https://pubmed.ncbi.nlm.nih.gov/31831060/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/31831060/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID31831060", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC1", "SC3" ], "favors_models": [], "evidence_class": "Moderate", "system": "cell experimental", "decisive_perturbation": false, "endogenous": false, "direction": "supports", "what_it_shows": "High-inoculum HHV6A microglia infection increased Aβ42, activation and phosphorylated tau secretion.", "what_it_does_not_show": "Imposed infection and immortalized/monocyte-derived microglia do not show endogenous neurodegeneration or human initiating infection.", "confounders_present": [ "Imposed infection and immortalized/monocyte-derived microglia do not show endogenous neurodegeneration or human initiating infection." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 48, "pmid": "30746447", "title": "Porphyromonas gingivalis in Alzheimer's disease brains: Evidence for disease causation and treatment with small-molecule inhibitors.", "citation": "Dominy SS, Lynch C, Ermini F et al. Porphyromonas gingivalis in Alzheimer's disease brains: Evidence for disease causation and treatment with small-molecule inhibitors. Science advances. 2019.", "doi": "10.1126/sciadv.aau3333", "pmcid": "PMC6357742", "url": "https://pubmed.ncbi.nlm.nih.gov/30746447/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/30746447/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID30746447", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC2", "SC3" ], "favors_models": [], "evidence_class": "Strong", "system": "animal experimental", "decisive_perturbation": true, "endogenous": false, "direction": "supports", "what_it_shows": "Human gingipain associations and imposed oral infection/inhibitor experiments supported a causal Pg injury pathway in mice.", "what_it_does_not_show": "Tissue association and pharmacologic rescue in imposed infection do not establish naturally necessary CNS Pg infection; systemic inflammation and off-target effects require controls.", "confounders_present": [ "Tissue association and pharmacologic rescue in imposed infection do not establish naturally necessary CNS Pg infection; systemic inflammation and off-target effects require controls." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 49, "pmid": "30281647", "title": "Chronic oral application of a periodontal pathogen results in brain inflammation, neurodegeneration and amyloid beta production in wild type mice.", "citation": "Ilievski V, Zuchowska PK, Green SJ et al. Chronic oral application of a periodontal pathogen results in brain inflammation, neurodegeneration and amyloid beta production in wild type mice. PloS one. 2018.", "doi": "10.1371/journal.pone.0204941", "pmcid": "PMC6169940", "url": "https://pubmed.ncbi.nlm.nih.gov/30281647/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/30281647/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID30281647", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3", "SC4" ], "favors_models": [], "evidence_class": "Moderate", "system": "animal experimental", "decisive_perturbation": false, "endogenous": false, "direction": "supports", "what_it_shows": "Chronic imposed oral Pg in young wild-type mice produced brain microbial signals, inflammation, degenerating-neuron staining and Aβ/tau changes.", "what_it_does_not_show": "Repeated exposure and small groups do not isolate CNS infection from systemic effects; NeuN expression alone is not cell death, though FluoroJade adds injury evidence.", "confounders_present": [ "Repeated exposure and small groups do not isolate CNS infection from systemic effects; NeuN expression alone is not cell death, though FluoroJade adds injury evidence." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 50, "pmid": "35328748", "title": "Intracerebral but Not Peripheral Infection of Live Porphyromonas gingivalis Exacerbates Alzheimer's Disease Like Amyloid Pathology in APP-TgCRND8 Mice.", "citation": "Aravindraja C, Sakthivel R, Liu X et al. Intracerebral but Not Peripheral Infection of Live Porphyromonas gingivalis Exacerbates Alzheimer's Disease Like Amyloid Pathology in APP-TgCRND8 Mice. International journal of molecular sciences. 2022.", "doi": "10.3390/ijms23063328", "pmcid": "PMC8954230", "url": "https://pubmed.ncbi.nlm.nih.gov/35328748/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/35328748/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID35328748", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3" ], "favors_models": [], "evidence_class": "Strong", "system": "animal experimental", "decisive_perturbation": true, "endogenous": false, "direction": "contradicts", "what_it_shows": "Oral infection did not accelerate amyloid in CRND8 mice; live intracerebral Pg increased deposition whereas heat-killed inoculation did not.", "what_it_does_not_show": "Direct brain injection bypasses entry/barrier questions; null oral effects are context-specific and do not exclude other pathogens or strains.", "confounders_present": [ "Direct brain injection bypasses entry/barrier questions; null oral effects are context-specific and do not exclude other pathogens or strains." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 51, "pmid": "40684176", "title": "Periodontitis-induced neuroinflammation triggers IFITM3-Aβ axis to cause alzheimer's disease-like pathology and cognitive decline.", "citation": "Kong L, Li J, Gao L et al. Periodontitis-induced neuroinflammation triggers IFITM3-Aβ axis to cause alzheimer's disease-like pathology and cognitive decline. Alzheimer's research & therapy. 2025.", "doi": "10.1186/s13195-025-01818-3", "pmcid": "PMC12275411", "url": "https://pubmed.ncbi.nlm.nih.gov/40684176/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/40684176/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID40684176", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3", "SC4" ], "favors_models": [], "evidence_class": "Moderate", "system": "animal experimental", "decisive_perturbation": false, "endogenous": false, "direction": "supports", "what_it_shows": "Pg periodontitis increased BBB permeability, glial IFITM3, amyloid and cognitive impairment in wild-type and APP/PS1 mice.", "what_it_does_not_show": "The abstract does not document selective IFITM3 dependency/rescue; barrier disruption can precede or mediate microbial entry rather than CNS infection necessarily initiating AD.", "confounders_present": [ "The abstract does not document selective IFITM3 dependency/rescue; barrier disruption can precede or mediate microbial entry rather than CNS infection necessarily initiating AD." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 52, "pmid": "15013562", "title": "Chlamydia pneumoniae induces Alzheimer-like amyloid plaques in brains of BALB/c mice.", "citation": "Little CS, Hammond CJ, MacIntyre A et al. Chlamydia pneumoniae induces Alzheimer-like amyloid plaques in brains of BALB/c mice. Neurobiology of aging. 2004.", "doi": "10.1016/S0197-4580(03)00127-1", "pmcid": "", "url": "https://pubmed.ncbi.nlm.nih.gov/15013562/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/15013562/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID15013562", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3", "SC4" ], "favors_models": [], "evidence_class": "Moderate", "system": "animal experimental", "decisive_perturbation": false, "endogenous": false, "direction": "supports", "what_it_shows": "An AD-brain Chlamydia isolate induced persistent olfactory infection and increasing Aβ-reactive deposits in BALB/c mice.", "what_it_does_not_show": "Imposed infection and plaque-like staining do not establish a complete AD trajectory or naturally necessary human infection.", "confounders_present": [ "Imposed infection and plaque-like staining do not establish a complete AD trajectory or naturally necessary human infection." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 53, "pmid": "17581756", "title": "Detection of amyloid beta aggregates in the brain of BALB/c mice after Chlamydia pneumoniae infection.", "citation": "Boelen E, Stassen FR, van der Ven AJ et al. Detection of amyloid beta aggregates in the brain of BALB/c mice after Chlamydia pneumoniae infection. Acta neuropathologica. 2007.", "doi": "10.1007/s00401-007-0252-3", "pmcid": "PMC2039821", "url": "https://pubmed.ncbi.nlm.nih.gov/17581756/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/17581756/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID17581756", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3" ], "favors_models": [], "evidence_class": "Strong", "system": "animal experimental", "decisive_perturbation": true, "endogenous": false, "direction": "null", "what_it_shows": "Independent Chlamydia model found Aβ aggregates in infected, mock and untreated mice with unlike transgenic plaque morphology.", "what_it_does_not_show": "Strain and assay differences limit an absolute negative conclusion; the experiment rejects unqualified infection-specific plaque induction in this setting.", "confounders_present": [ "Strain and assay differences limit an absolute negative conclusion; the experiment rejects unqualified infection-specific plaque induction in this setting." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 54, "pmid": "25538615", "title": "Detection of bacterial antigens and Alzheimer's disease-like pathology in the central nervous system of BALB/c mice following intranasal infection with a laboratory isolate of Chlamydia pneumoniae.", "citation": "Little CS, Joyce TA, Hammond CJ et al. Detection of bacterial antigens and Alzheimer's disease-like pathology in the central nervous system of BALB/c mice following intranasal infection with a laboratory isolate of Chlamydia pneumoniae. Frontiers in aging neuroscience. 2014.", "doi": "10.3389/fnagi.2014.00304", "pmcid": "PMC4257355", "url": "https://pubmed.ncbi.nlm.nih.gov/25538615/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/25538615/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID25538615", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3", "SC4" ], "favors_models": [], "evidence_class": "Moderate", "system": "animal experimental", "decisive_perturbation": true, "endogenous": false, "direction": "supports", "what_it_shows": "Laboratory Chlamydia infection caused limited olfactory persistence and transient amyloid changes that resolved as antigen burden fell.", "what_it_does_not_show": "Strain-specific resolution differs from sustained human AD and does not demonstrate pathogen requirement for a sporadic fraction.", "confounders_present": [ "Strain-specific resolution differs from sustained human AD and does not demonstrate pathogen requirement for a sporadic fraction." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [ "Related Chlamydia isolate programme to 15013562; strain-dependent experiments are not independent human causal lines." ] }, { "n": 55, "pmid": "35177758", "title": "Chlamydia pneumoniae can infect the central nervous system via the olfactory and trigeminal nerves and contributes to Alzheimer's disease risk.", "citation": "Chacko A, Delbaz A, Walkden H et al. Chlamydia pneumoniae can infect the central nervous system via the olfactory and trigeminal nerves and contributes to Alzheimer's disease risk. Scientific reports. 2022.", "doi": "10.1038/s41598-022-06749-9", "pmcid": "PMC8854390", "url": "https://pubmed.ncbi.nlm.nih.gov/35177758/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/35177758/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID35177758", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3", "SC4" ], "favors_models": [], "evidence_class": "Moderate", "system": "animal experimental", "decisive_perturbation": true, "endogenous": false, "direction": "supports", "what_it_shows": "Intranasal Chlamydia rapidly invaded peripheral nerves/CNS and produced adjacent Aβ changes; nasal injury altered peripheral infection.", "what_it_does_not_show": "Capability to traverse nerves is not a human incidence-risk measurement; imposed dose and injury do not establish entry before native AD/barrier lesions.", "confounders_present": [ "Capability to traverse nerves is not a human incidence-risk measurement; imposed dose and injury do not establish entry before native AD/barrier lesions." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 56, "pmid": "30610193", "title": "Microglia and amyloid precursor protein coordinate control of transient Candida cerebritis with memory deficits.", "citation": "Wu Y, Du S, Johnson JL et al. Microglia and amyloid precursor protein coordinate control of transient Candida cerebritis with memory deficits. Nature communications. 2019.", "doi": "10.1038/s41467-018-07991-4", "pmcid": "PMC6320369", "url": "https://pubmed.ncbi.nlm.nih.gov/30610193/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/30610193/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID30610193", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC1", "SC3" ], "favors_models": [], "evidence_class": "Strong", "system": "animal experimental", "decisive_perturbation": true, "endogenous": false, "direction": "supports", "what_it_shows": "Low-grade candidemia induced glial granulomas, APP/Aβ-associated clearance and transient memory deficits, while Aβ enhanced antifungal phagocytosis.", "what_it_does_not_show": "Acute clearing cerebritis is not chronic sporadic AD; APP and microglial effects do not isolate beneficial plaque deposition over decades.", "confounders_present": [ "Acute clearing cerebritis is not chronic sporadic AD; APP and microglial effects do not isolate beneficial plaque deposition over decades." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 57, "pmid": "41853978", "title": "Herpesvirus genome integration in whole-genome sequences of dementia and control cohorts.", "citation": "Piotrowski SL, Allnutt MA, Johnson K et al. Herpesvirus genome integration in whole-genome sequences of dementia and control cohorts. Alzheimer's & dementia : the journal of the Alzheimer's Association. 2026.", "doi": "10.1002/alz.71047", "pmcid": "PMC13093769", "url": "https://pubmed.ncbi.nlm.nih.gov/41853978/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/41853978/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID41853978", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC2" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": true, "endogenous": false, "direction": "null", "what_it_shows": "Whole-genome screening found partial HHV6 integration signals enriched in synucleinopathy cohorts rather than AD.", "what_it_does_not_show": "Blood/genomic integration is not active CNS infection; low PathSeq signals need orthogonal validation and do not determine lifetime exposure.", "confounders_present": [ "Blood/genomic integration is not active CNS infection; low PathSeq signals need orthogonal validation and do not determine lifetime exposure." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [ "Whole-genome dementia repositories may overlap other genomic programmes; integration is not active infection." ] }, { "n": 58, "pmid": "40960941", "title": "Cerebrospinal fluid microbiome revisited: no evidence of resident bacteria in archived samples.", "citation": "Ward A, Park H, Cheng B et al. Cerebrospinal fluid microbiome revisited: no evidence of resident bacteria in archived samples. Microbiology spectrum. 2025.", "doi": "10.1128/spectrum.01308-25", "pmcid": "PMC12502689", "url": "https://pubmed.ncbi.nlm.nih.gov/40960941/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/40960941/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID40960941", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC2" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": true, "endogenous": false, "direction": "null", "what_it_shows": "CSF sequencing with spike-ins and meningitis controls found negligible bacterial content consistent with contamination rather than a resident microbiome.", "what_it_does_not_show": "CSF negatives do not exclude focal tissue infection or prior cleared infection; sequencing limits must remain prespecified.", "confounders_present": [ "CSF negatives do not exclude focal tissue infection or prior cleared infection; sequencing limits must remain prespecified." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 59, "pmid": "41319103", "title": "Vessel-associated microglia are differentially activated and distributed in relation to systemic infection and Alzheimer's disease.", "citation": "Milner O, Fisher RA, Asby DJ et al. Vessel-associated microglia are differentially activated and distributed in relation to systemic infection and Alzheimer's disease. Brain pathology (Zurich, Switzerland). 2026.", "doi": "10.1111/bpa.70052", "pmcid": "PMC13051992", "url": "https://pubmed.ncbi.nlm.nih.gov/41319103/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/41319103/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID41319103", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC2", "SC4" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": false, "endogenous": false, "direction": "supports", "what_it_shows": "Terminal systemic infection and AD associated with distinct vessel-associated microglial activation and vascular/barrier markers.", "what_it_does_not_show": "Terminal infection and cross-sectional barrier changes are progression/confounding evidence, not infection-before-lesion order.", "confounders_present": [ "Terminal infection and cross-sectional barrier changes are progression/confounding evidence, not infection-before-lesion order." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 60, "pmid": "39885359", "title": "Plasma proteomic evidence for increased β-amyloid pathology after SARS-CoV-2 infection.", "citation": "Duff EP, Zetterberg H, Heslegrave A et al. Plasma proteomic evidence for increased β-amyloid pathology after SARS-CoV-2 infection. Nature medicine. 2025.", "doi": "10.1038/s41591-024-03426-4", "pmcid": "PMC11922756", "url": "https://pubmed.ncbi.nlm.nih.gov/39885359/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/39885359/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID39885359", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3", "SC4" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": false, "endogenous": false, "direction": "supports", "what_it_shows": "Paired UK Biobank plasma before/after COVID showed AD-associated biomarker shifts, larger with vulnerability/severity.", "what_it_does_not_show": "Plasma biomarkers and post-hoc matching do not establish incident AD or direct CNS invasion; systemic inflammation is a viable alternative.", "confounders_present": [ "Plasma biomarkers and post-hoc matching do not establish incident AD or direct CNS invasion; systemic inflammation is a viable alternative." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 61, "pmid": "22801501", "title": "A mutation in APP protects against Alzheimer's disease and age-related cognitive decline.", "citation": "Jonsson T, Atwal JK, Steinberg S et al. A mutation in APP protects against Alzheimer's disease and age-related cognitive decline. Nature. 2012.", "doi": "10.1038/nature11283", "pmcid": "", "url": "https://pubmed.ncbi.nlm.nih.gov/22801501/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/22801501/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID22801501", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3" ], "favors_models": [], "evidence_class": "Strong", "system": "human observational", "decisive_perturbation": true, "endogenous": false, "direction": "contradicts", "what_it_shows": "APP A673T protection paired with reduced beta cleavage provides a human molecular alternative to obligatory infection initiation.", "what_it_does_not_show": "Rare genetic protection does not prove pathogens never contribute; no direct pathogen measurement or selective antimicrobial mediator was tested.", "confounders_present": [ "Rare genetic protection does not prove pathogens never contribute; no direct pathogen measurement or selective antimicrobial mediator was tested." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 62, "pmid": "20209079", "title": "The Alzheimer's disease-associated amyloid beta-protein is an antimicrobial peptide.", "citation": "Soscia SJ, Kirby JE, Washicosky KJ et al. The Alzheimer's disease-associated amyloid beta-protein is an antimicrobial peptide. PloS one. 2010.", "doi": "10.1371/journal.pone.0009505", "pmcid": "PMC2831066", "url": "https://pubmed.ncbi.nlm.nih.gov/20209079/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/20209079/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID20209079", "access_depth": "full_text_partial", "access_note": "Complete primary abstract and linked-status metadata examined. Selected body sections: 1:Results:paragraph2, 1:Results:paragraph6, 3:Materials and Methods:paragraph6, 3:Materials and Methods:paragraph12. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC1" ], "favors_models": [], "evidence_class": "Strong", "system": "cell experimental", "decisive_perturbation": true, "endogenous": false, "direction": "supports", "what_it_shows": "Synthetic Aβ and AD homogenates inhibited microbes; Aβ immunodepletion reduced homogenate antimicrobial activity.", "what_it_does_not_show": "Original Results find predominantly bacteriostatic Aβ effects with later growth recovery; Methods note diffusion/aggregation problems in agar assays and pooled homogenate immunodepletion. Concentration/aggregation and APP-containing antibody specificity limit physiological interpretation; chronic plaques and initiating infection are separate claims.", "confounders_present": [ "Original Results find predominantly bacteriostatic Aβ effects with later growth recovery; Methods note diffusion/aggregation problems in agar assays and pooled homogenate immunodepletion. Concentration/aggregation and APP-containing antibody specificity limit physiological interpretation; chronic plaques and initiating infection are separate claims." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 63, "pmid": "27225182", "title": "Amyloid-β peptide protects against microbial infection in mouse and worm models of Alzheimer's disease.", "citation": "Kumar DK, Choi SH, Washicosky KJ et al. Amyloid-β peptide protects against microbial infection in mouse and worm models of Alzheimer's disease. Science translational medicine. 2016.", "doi": "10.1126/scitranslmed.aaf1059", "pmcid": "PMC5505565", "url": "https://pubmed.ncbi.nlm.nih.gov/27225182/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/27225182/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID27225182", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC1" ], "favors_models": [], "evidence_class": "Strong", "system": "animal experimental", "decisive_perturbation": true, "endogenous": false, "direction": "supports", "what_it_shows": "Aβ-expressing mouse/worm systems showed microbial protection, with fibril-associated entrapment after imposed brain challenge.", "what_it_does_not_show": "Transgenes and intracerebral challenge establish bounded antimicrobial competence; neither protective deposition in sporadic AD nor a necessary initiating pathogen follows.", "confounders_present": [ "Transgenes and intracerebral challenge establish bounded antimicrobial competence; neither protective deposition in sporadic AD nor a necessary initiating pathogen follows." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 64, "pmid": "39189744", "title": "HSV-1 infection induces phosphorylated tau propagation among neurons via extracellular vesicles.", "citation": "Protto V, Miteva MT, Iannuzzi F et al. HSV-1 infection induces phosphorylated tau propagation among neurons via extracellular vesicles. mBio. 2024.", "doi": "10.1128/mbio.01522-24", "pmcid": "PMC11481531", "url": "https://pubmed.ncbi.nlm.nih.gov/39189744/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/39189744/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID39189744", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3" ], "favors_models": [], "evidence_class": "Moderate", "system": "animal experimental", "decisive_perturbation": false, "endogenous": false, "direction": "supports", "what_it_shows": "HSV induced EV-associated phosphorylated tau and transfer into recipient neurons, including tau-null recipients.", "what_it_does_not_show": "Uptake into tau-null cells is not recipient-templated seeding; acute infection, overexpressed tagged tau and transfer do not establish progressive native human AD.", "confounders_present": [ "Uptake into tau-null cells is not recipient-templated seeding; acute infection, overexpressed tagged tau and transfer do not establish progressive native human AD." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] }, { "n": 65, "pmid": "40393802", "title": "Association between herpes simplex virus type 1 and the risk of Alzheimer's disease: a retrospective case-control study.", "citation": "Liu Y, Johnston C, Jarousse N et al. Association between herpes simplex virus type 1 and the risk of Alzheimer's disease: a retrospective case-control study. BMJ open. 2025.", "doi": "10.1136/bmjopen-2024-093946", "pmcid": "PMC12104942", "url": "https://pubmed.ncbi.nlm.nih.gov/40393802/", "source_pointer": "https://pubmed.ncbi.nlm.nih.gov/40393802/", "tier": "A", "source_tier": "A", "kind": "primary", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID40393802", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "relates_to_subclaims": [ "SC3" ], "favors_models": [], "evidence_class": "Moderate", "system": "human observational", "decisive_perturbation": false, "endogenous": false, "direction": "supports", "what_it_shows": "Matched US claims linked diagnosed HSV1 history with AD and antivirals with moderately lower risk.", "what_it_does_not_show": "Clinically coded HSV is a small selected subset of common infection; residual care/indication bias and absent CNS mediator prevent causal fraction attribution.", "confounders_present": [ "Clinically coded HSV is a small selected subset of common infection; residual care/indication bias and absent CNS mediator prevent causal fraction attribution." ], "verification": "verified", "verification_note": "Bounded source attribution; not proof of the nominal mechanism.", "citation_context": { "retrieved": false, "supporting_count": 0, "mentioning_count": 0, "contrasting_count": 0, "notable_contrasting_statements": [] }, "shared_components": [] } ], "verification_summary": { "load_bearing_claims_checked": 70, "verified": 70, "unverified": 0, "contradicted": 0, "note": "Verified attribution is distinct from mechanism truth or complete body access." }, "factual_issues_found": [], "cap_rules_applied": [ { "subclaim_id": "SC2", "cap": "Β", "cap_source": "universal", "triggered": true, "trigger_text_quoted": "association without temporal or perturbational proof caps at Β.", "specific_trigger": "Several pathogens or components are reported in AD brains, but reproducibility and specificity differ. HSV controls, HHV read-mapping/DDPCR challenges, failed Chlamydia/Borrelia replication, inherited integration and contamination remain. For the registered contamination-controlled human enrichment scope, associations do not establish a reproducible initiating burden.", "resulting_ceiling": "Β" }, { "subclaim_id": "SC4", "cap": "Β", "cap_source": "universal", "triggered": true, "trigger_text_quoted": "association without temporal or perturbational proof caps at Β.", "specific_trigger": "Prediagnostic serology and repeated infection models offer temporal clues, yet peripheral positivity and clinical diagnosis precede neither proven BBB failure nor first AD lesions. Late autopsies, tissue localization and plasma biomarker shifts do not directly order CNS pathogen entry before preclinical pathology.", "resulting_ceiling": "Β" } ], "cap_precedence_resolutions": [ { "collision": "Perturbation in a defined setting versus broader inference", "subclaim_scope_cap_binds_on": "CNS infection by specific pathogens is a necessary initiating event in a substantial fraction of sporadic Alzheimer's disease.", "subclaim_scope_threshold_binds_on": "The precise experimentally tested subclaim scope", "resolution": "Rubric01 credits rigorous natural experiments and hard clinical interventions. Welsh/Australian/Canadian eligibility designs cross causal thresholds for their dementia endpoint and are not dismissed as observational. Antimicrobial/challenge experiments cross narrow functional thresholds, while human serology and late tissue do not supply CNS initiation. The assembled set is assessed together without re-capping it as exogenous-only; missing pathogen-specific temporal mediation and fraction attribution stop the registered scope. Post-onset failures cannot refute a bounded earlier hit, but neither can an unspecified hit evade all negative evidence.", "note": "Convergent lines are assessed as a set; one weak leg is not re-capped over the assembled case." } ], "boundary_check_BGD": [ { "subclaim_id": "SC1", "field_valid_perturbation_quote": "\n- Endogenous genetic deletion, suppression, or degron depletion of the proposed mediator in vivo\n- Selective pathway inhibition that changes onset/progression while preserving broader viability\n- Vagotomy-type natural experiment, only if confounding is rigorously controlled AND effect is disease-initiation relevant rather than merely associated", "qualifying_evidence_present": "yes", "qualifying_evidence_citation": "PMID22003387, PMID39753133, PMID33268524, PMID30610193, PMID20209079, PMID27225182", "gamma_hard_rules_triggered": [ "Concentration and imposed-challenge scope remain explicit." ], "disease_phenotype_relevance": "yes", "perturbation_result_positive": "yes", "perturbation_result_note": "Synthetic/homogenate specificity and mouse/worm infection outcomes support antimicrobial or entrapment competence in defined models. Acute host protection is credited without equating it with beneficial chronic human plaque deposition; physiologic exposure and chronic tradeoffs prevent stronger broad inference.", "ceiling_from_boundary_check": "Δ or higher" }, { "subclaim_id": "SC2", "field_valid_perturbation_quote": "\n- Endogenous genetic deletion, suppression, or degron depletion of the proposed mediator in vivo\n- Selective pathway inhibition that changes onset/progression while preserving broader viability\n- Vagotomy-type natural experiment, only if confounding is rigorously controlled AND effect is disease-initiation relevant rather than merely associated", "qualifying_evidence_present": "no", "qualifying_evidence_citation": "PMID15602731, PMID31983538, PMID32336252, PMID26444787, PMID10655406, PMID10878049, PMID9766207, PMID39753133, PMID30746447, PMID41853978, PMID40960941", "gamma_hard_rules_triggered": [ "Human enrichment is heterogeneous and detection-specific." ], "disease_phenotype_relevance": "yes", "perturbation_result_positive": "no", "perturbation_result_note": "Several pathogens or components are reported in AD brains, but reproducibility and specificity differ. HSV controls, HHV read-mapping/DDPCR challenges, failed Chlamydia/Borrelia replication, inherited integration and contamination remain. For the registered contamination-controlled human enrichment scope, associations do not establish a reproducible initiating burden.", "ceiling_from_boundary_check": "Γ" }, { "subclaim_id": "SC3", "field_valid_perturbation_quote": "\n- Endogenous genetic deletion, suppression, or degron depletion of the proposed mediator in vivo\n- Selective pathway inhibition that changes onset/progression while preserving broader viability\n- Vagotomy-type natural experiment, only if confounding is rigorously controlled AND effect is disease-initiation relevant rather than merely associated", "qualifying_evidence_present": "no", "qualifying_evidence_citation": "PMID15602731, PMID33888766, PMID34560893, PMID26444787, PMID40175543, PMID40267506, PMID41579903, PMID41338191, PMID39053634, PMID40562756, PMID41405855, PMID42210804, PMID14962152, PMID22718435, PMID22003387, PMID30870531, PMID35754275, PMID39772530, PMID33268524, PMID30746447, PMID35328748, PMID17581756, PMID25538615, PMID35177758, PMID30610193, PMID22801501", "gamma_hard_rules_triggered": [ "Necessary antecedent CNS mediator and human fraction are unmeasured." ], "disease_phenotype_relevance": "yes", "perturbation_result_positive": "no", "perturbation_result_note": "Native human necessity and an attributable substantial fraction have not been demonstrated. Mechanistic infection models and vaccine natural experiments exceed mere colocalization, but they do not locate the causal mediator in CNS infection before AD. Post-onset valacyclovir failure is bounded counterevidence to ongoing treatable HSV replication, not proof against every prespecified earlier hit.", "ceiling_from_boundary_check": "Γ" }, { "subclaim_id": "SC4", "field_valid_perturbation_quote": "\n- Endogenous genetic deletion, suppression, or degron depletion of the proposed mediator in vivo\n- Selective pathway inhibition that changes onset/progression while preserving broader viability\n- Vagotomy-type natural experiment, only if confounding is rigorously controlled AND effect is disease-initiation relevant rather than merely associated", "qualifying_evidence_present": "no", "qualifying_evidence_citation": "PMID33888766, PMID30870531, PMID39772530, PMID25538615, PMID35177758", "gamma_hard_rules_triggered": [ "Prediagnostic is not prelesion; entry/barrier order is not observed." ], "disease_phenotype_relevance": "yes", "perturbation_result_positive": "no", "perturbation_result_note": "Prediagnostic serology and repeated infection models offer temporal clues, yet peripheral positivity and clinical diagnosis precede neither proven BBB failure nor first AD lesions. Late autopsies, tissue localization and plasma biomarker shifts do not directly order CNS pathogen entry before preclinical pathology.", "ceiling_from_boundary_check": "Γ" } ], "thresholds_tested": [ { "subclaim_id": "SC1", "threshold": "Δ", "requirement_quoted": "Requires at least one genuine causal perturbation in a disease-relevant in vivo system, or equivalent human natural experiment that materially supports the mechanism.", "satisfied": "yes", "supporting_evidence": [ "[40] Replication-restricted viral strains and antivirals separated infection stages producing Aβ and phosphorylated tau.", "[45] Human HSV-associated proteins and organoid cGAS-STING-TBK1 perturbations linked phosphorylation with protection against infected-neuron death.", "[46] HSV-associated Aβ localization differed between 2D infected cells and 3D surrounding cells.", "[56] Low-grade candidemia induced glial granulomas, APP/Aβ-associated clearance and transient memory deficits, while Aβ enhanced antifungal phagocytosis.", "[62] Synthetic Aβ and AD homogenates inhibited microbes; Aβ immunodepletion reduced homogenate antimicrobial activity.", "[63] Aβ-expressing mouse/worm systems showed microbial protection, with fibril-associated entrapment after imposed brain challenge." ], "what_would_cross_it": "" }, { "subclaim_id": "SC1", "threshold": "Ε", "requirement_quoted": "Requires causal support in a defined context, but with clear restriction by subtype, disease stage, model, or tissue.\n\nUse Ε when there is a real causal contribution, but generalization to the entire disease class fails.", "satisfied": "yes", "supporting_evidence": [ "[40] Replication-restricted viral strains and antivirals separated infection stages producing Aβ and phosphorylated tau.", "[45] Human HSV-associated proteins and organoid cGAS-STING-TBK1 perturbations linked phosphorylation with protection against infected-neuron death.", "[46] HSV-associated Aβ localization differed between 2D infected cells and 3D surrounding cells.", "[56] Low-grade candidemia induced glial granulomas, APP/Aβ-associated clearance and transient memory deficits, while Aβ enhanced antifungal phagocytosis.", "[62] Synthetic Aβ and AD homogenates inhibited microbes; Aβ immunodepletion reduced homogenate antimicrobial activity.", "[63] Aβ-expressing mouse/worm systems showed microbial protection, with fibril-associated entrapment after imposed brain challenge." ], "what_would_cross_it": "" }, { "subclaim_id": "SC1", "threshold": "Ζ", "requirement_quoted": "Requires:\n- Multiple independent causal lines in vivo\n- Replication across at least two relevant systems\n- Narrowing of major alternative models", "satisfied": "no", "supporting_evidence": [ "[40] Replication-restricted viral strains and antivirals separated infection stages producing Aβ and phosphorylated tau.", "[45] Human HSV-associated proteins and organoid cGAS-STING-TBK1 perturbations linked phosphorylation with protection against infected-neuron death.", "[46] HSV-associated Aβ localization differed between 2D infected cells and 3D surrounding cells.", "[56] Low-grade candidemia induced glial granulomas, APP/Aβ-associated clearance and transient memory deficits, while Aβ enhanced antifungal phagocytosis.", "[62] Synthetic Aβ and AD homogenates inhibited microbes; Aβ immunodepletion reduced homogenate antimicrobial activity.", "[63] Aβ-expressing mouse/worm systems showed microbial protection, with fibril-associated entrapment after imposed brain challenge." ], "what_would_cross_it": "Physiologic peptide-specific loss/restoration changes pathogen clearance and host injury without broader APP/immune disruption, replicated with chronic outcome tradeoffs." }, { "subclaim_id": "SC2", "threshold": "Δ", "requirement_quoted": "Requires at least one genuine causal perturbation in a disease-relevant in vivo system, or equivalent human natural experiment that materially supports the mechanism.", "satisfied": "no", "supporting_evidence": [ "[3] Intrathecal HSV antibodies were frequent in both AD and controls without significant group difference.", "[10] Independent sequence screening and HHV6 PCR across brain repositories found little AD specificity.", "[11] Alternative reanalysis failed to reproduce HHV7 reads and found HHV6A in few high-ranked original samples, identifying low-specificity mapping.", "[12] HHV6 antibodies, avidity and regional volumes did not distinguish AD, aMCI and controls.", "[15] Nested PCR and immunostaining in twenty AD cases failed to detect Chlamydia.", "[16] Repeated PCR across up to six regions and culture failed unequivocal Chlamydia detection in AD/control brains.", "[21] Multiple-target PCR and serology failed to support Borrelia involvement in examined AD samples.", "[45] Human HSV-associated proteins and organoid cGAS-STING-TBK1 perturbations linked phosphorylation with protection against infected-neuron death.", "[48] Human gingipain associations and imposed oral infection/inhibitor experiments supported a causal Pg injury pathway in mice.", "[57] Whole-genome screening found partial HHV6 integration signals enriched in synucleinopathy cohorts rather than AD.", "[58] CSF sequencing with spike-ins and meningitis controls found negligible bacterial content consistent with contamination rather than a resident microbiome." ], "what_would_cross_it": "Independent blinded tissue and ante-mortem sampling with spike-ins, extraction blanks, localization and viable/transcriptional evidence reproducibly identifies pathogen enrichment beyond controls." }, { "subclaim_id": "SC3", "threshold": "Δ", "requirement_quoted": "Requires at least one genuine causal perturbation in a disease-relevant in vivo system, or equivalent human natural experiment that materially supports the mechanism.", "satisfied": "no", "supporting_evidence": [ "[3] Intrathecal HSV antibodies were frequent in both AD and controls without significant group difference.", "[7] Rotterdam HSV IgG associated with cognitive decline but not incident dementia or AD.", "[8] Herpes-proxy Mendelian analyses gave heterogeneous results including positive mononucleosis and inverse shingles associations.", "[12] HHV6 antibodies, avidity and regional volumes did not distinguish AD, aMCI and controls.", "[24] Welsh birth-date eligibility discontinuity supported reduced or delayed dementia diagnosis after live zoster vaccination.", "[25] Australian birth-date vaccine eligibility reduced recorded dementia diagnoses with balanced baseline health and preventive-care controls.", "[26] Canadian eligibility discontinuities and cross-province comparisons supported delayed/reduced dementia diagnoses after live zoster vaccination.", "[27] Welsh eligibility analysis found effects on MCI diagnoses and dementia-related deaths after diagnosis.", "[28] The US vaccine transition comparison associated recombinant vaccination with greater dementia-diagnosis-free time than live vaccination.", "[29] AS01-adjuvanted zoster and RSV vaccines associated similarly with lower short-term dementia risk.", "[31] VALAD valacyclovir worsened the primary cognitive outcome versus placebo and did not improve amyloid/tau PET in early symptomatic HSV-seropositive disease.", "[32] VALMCI found no amyloid-PET, cognitive or functional benefit over twelve months in amyloid-positive HSV-seropositive MCI.", "[34] Antibiotic combination reduced six-month cognitive decline in a small randomized trial but not significantly at twelve months.", "[35] DARAD failed cognitive/functional benefit from doxycycline/rifampin and showed deterioration with individual agents.", "[40] Replication-restricted viral strains and antivirals separated infection stages producing Aβ and phosphorylated tau.", "[41] Repeated thermal reactivation of imposed HSV produced CNS replication, accumulated pathology and persistent cognitive deficits.", "[43] VZV alone induced inflammation without Aβ/tau but reactivated latent HSV with AD-like changes.", "[44] Controlled injury reactivated latent HSV and increased AD-like changes; mock infection and IL1beta blockade separated contributing pathways.", "[46] HSV-associated Aβ localization differed between 2D infected cells and 3D surrounding cells.", "[48] Human gingipain associations and imposed oral infection/inhibitor experiments supported a causal Pg injury pathway in mice.", "[50] Oral infection did not accelerate amyloid in CRND8 mice; live intracerebral Pg increased deposition whereas heat-killed inoculation did not.", "[53] Independent Chlamydia model found Aβ aggregates in infected, mock and untreated mice with unlike transgenic plaque morphology.", "[54] Laboratory Chlamydia infection caused limited olfactory persistence and transient amyloid changes that resolved as antigen burden fell.", "[55] Intranasal Chlamydia rapidly invaded peripheral nerves/CNS and produced adjacent Aβ changes; nasal injury altered peripheral infection.", "[56] Low-grade candidemia induced glial granulomas, APP/Aβ-associated clearance and transient memory deficits, while Aβ enhanced antifungal phagocytosis.", "[61] APP A673T protection paired with reduced beta cleavage provides a human molecular alternative to obligatory infection initiation." ], "what_would_cross_it": "An antecedent CNS-pathogen-positive, biomarker-negative cohort and selective removal/prevention instrument reduce biomarker-confirmed AD conversion with mediator attribution and a prespecified substantial fraction, replicated independently." }, { "subclaim_id": "SC4", "threshold": "Δ", "requirement_quoted": "Requires at least one genuine causal perturbation in a disease-relevant in vivo system, or equivalent human natural experiment that materially supports the mechanism.", "satisfied": "no", "supporting_evidence": [ "[7] Rotterdam HSV IgG associated with cognitive decline but not incident dementia or AD.", "[41] Repeated thermal reactivation of imposed HSV produced CNS replication, accumulated pathology and persistent cognitive deficits.", "[44] Controlled injury reactivated latent HSV and increased AD-like changes; mock infection and IL1beta blockade separated contributing pathways.", "[54] Laboratory Chlamydia infection caused limited olfactory persistence and transient amyloid changes that resolved as antigen burden fell.", "[55] Intranasal Chlamydia rapidly invaded peripheral nerves/CNS and produced adjacent Aβ changes; nasal injury altered peripheral infection." ], "what_would_cross_it": "Paired longitudinal CNS pathogen, BBB and amyloid/tau measurements with validated sensitivity establish entry before lesions and barrier failure rather than inference from motor/cognitive diagnosis." } ], "generalization_check": { "generalization_tested": "yes", "context_boundary_mapped": "yes", "internal_negative_controls": [ "Virus-seronegative/brain-negative controls and intrathecal antibody comparison.", "Alternative read mapping, ddPCR retesting and inherited-integration assessment.", "Multiple-region negative Chlamydia PCR/culture and negative Borrelia targets.", "CSF extraction spike-ins and meningitis positive control.", "Mock infection, live versus heat-killed bacteria and oral versus intracerebral route.", "Eligibility placebo thresholds, preventive-care controls and any-cause versus etiologic outcomes.", "Randomized placebo antimicrobial trials and biomarker/cognitive endpoint separation." ], "note": "Pathogen, strain, route, inoculum, host genotype and disease stage change experimental outcomes. Human evidence spans tissue, serology, claims, natural experiments and trials but does not measure a common necessary CNS pathway. Susceptibility subgroups must be defined before outcomes; a claimed substantial fraction needs a denominator and validated infection sensitivity." }, "falsification_patterns_met": [ { "pattern": "Specific detection is not reproducible across assays", "evidence": "PMID31983538 and PMID32336252 challenge HHV assignments; PMID10655406 and PMID10878049 challenge common Chlamydia detection.", "downgrade_applied": false, "note": "Already incorporated into SC2 and fraction uncertainty." }, { "pattern": "Peripheral infection fails imposed amyloid acceleration", "evidence": "PMID35328748 and PMID17581756 constrain unqualified sufficiency in tested systems.", "downgrade_applied": false, "note": "Scope limits are not duplicated as a global penalty." }, { "pattern": "Post-onset antimicrobial benefit fails", "evidence": "VALAD cognitive worsening, VALMCI null and DARAD failure reject these specific treatment predictions.", "downgrade_applied": false, "note": "Does not refute a prespecified earlier cleared hit." } ], "pitfalls_flagged": [ { "pitfall": "Dementia effect relabelled biomarker-confirmed AD prevention", "where": "Vaccination and claims analyses." }, { "pitfall": "Peripheral serology relabelled CNS active infection", "where": "Cohorts and valacyclovir enrollment." }, { "pitfall": "Entry after lesions treated as necessary initiation", "where": "Late autopsy localization and BBB changes." }, { "pitfall": "Antimicrobial peptide competence treated as beneficial plaques", "where": "Aβ culture/challenge studies." }, { "pitfall": "EV uptake treated as recipient tau templating", "where": "Tau-null recipient experiment." }, { "pitfall": "Unlimited early-hit rescue after every negative study", "where": "Models lacking fixed pathogen and time window." } ], "causal_tally_audit": { "tally_claimed_by_document": 36, "tally_after_audit": 36, "items_rejected": [ "Null and negative contrasts are discriminators, not positive threshold crossings. Reports and replications are not independent causal lines.", "Natural experiment estimates differ for eligibility and vaccine receipt.", "Prediagnostic samples can follow preclinical AD lesions.", "Antibody staining controls validate assay performance without proving viable initiating infection." ] }, "steelman": { "case_one_rung_higher": "Δ is attractive because causal vaccine effects, mouse inhibitor rescue and recurrent infection are real. For the registered necessary CNS-initiation fraction, it would require an endogenous or equivalent human mediator test tied to prelesion AD conversion; the existing endpoints cannot supply that missing identification.", "case_one_rung_lower": "Β would undercredit the actual challenge pathways, antimicrobial specificity and rigorous vaccine/interventional discrimination. The necessary initiating mechanism is biologically testable and more than a tissue-colocalization narrative.", "which_rejected": "Γ preserves mechanistic plausibility while refusing to replace the registered necessary human CNS gate with risk modification or challenge capability. Defined antimicrobial competence and dementia-prevention effects remain separately credited.", "blocking_cap_threshold_or_missing_experiment": "Missing experiment: Predefine one pathogen, a susceptible sporadic population and an early time window, then follow CNS pathogen-positive and negative biomarker-negative participants with validated paired fluid/barrier and amyloid/tau measures; apply a selective prevention/removal instrument where feasible." }, "final_score": { "hsef_level": "Γ", "hsef_descriptor": "Mechanistically plausible, partial system support", "confidence": "Moderate", "confidence_rationale": "65 primary reports with 5 selected partial-body examinations; density, heterogeneous controls and incomplete access set the confidence, not correctness.", "rests_on_non_peer_reviewed_work": false, "rationale": "Γ for the preregistered SC3 etiologic gate. Scope-matched and primary-subclaim rules return Γ; weakest-link Β is shown separately for unverified enrichment/entry-order gates. No blanket Gamma cap is imposed on the vaccine/genetic/intervention set. The unmet positive burden is pathogen-specific CNS initiation with a measured substantial human fraction; dementia prevention, antimicrobial activity and imposed infection capability do not jointly measure it. Defined antimicrobial competence earns Ε and vaccine effects on recorded dementia receive full causal credit separately." }, "role_of_mechanism": { "classification": "reinforcing / stabilizing factor", "derivation_step_matched": 5, "derivation": "The supported disease-relevant role is context-dependent acceleration or inflammatory reinforcement in imposed infection systems, with a possible human risk contribution. Human CNS initiating necessity/rate limitation is not established; secondary entry remains possible but not proven as the sole ordering.", "tournament_used_as_tiebreaker": false, "note": "Derived from causal direction, not tournament rank." }, "extended_scoring_MSD": { "momentum": { "value": "Mechanistic only", "artifact": "The named programmes in this corpus — the Welsh, Australian and Canadian zoster-vaccine eligibility natural experiments, the VALAD and VALMCI randomized antiviral trials, and recent periodontitis and HCMV tissue work — are completed and published rather than running. No presently recruiting study addressing the SC3 boundary check, an antecedent CNS-pathogen-positive and biomarker-negative cohort with a selective prevention or removal instrument, is identified.", "justification": "The named programmes in this corpus — the Welsh, Australian and Canadian zoster-vaccine eligibility natural experiments, the VALAD and VALMCI randomized antiviral trials, and recent periodontitis and HCMV tissue work — are completed and published rather than running. No presently recruiting study addressing the SC3 boundary check, an antecedent CNS-pathogen-positive and biomarker-negative cohort with a selective prevention or removal instrument, is identified." }, "stability": { "value": "Stable", "trigger": "No named pending result is asserted to be likely to move the registered score imminently.", "justification": "No named pending result is asserted to be likely to move the registered score imminently." }, "divergence": { "implied_level": null, "implied_level_basis": "No single field-implied level is defensible from conflicting framings.", "assessed_level": "Γ", "gap_in_rungs": null, "value": "Contested", "justification": "No manufactured field consensus or arithmetic gap." }, "calibration_note": "M/S/D never modify HSEF level or confidence." }, "change_record": { "applies": false, "prior_level": "Ranking categorical verdict visible; no prior letter used as a target", "prior_confidence": null, "prior_source": null, "derived_before_consulting_prior": false, "new_level": "Γ", "direction": "newly assigned", "what_moved_it": "Fresh primary evidence appraisal; not blinded.", "divergence_from_other_reviewers": null }, "proposed_decisive_experiments": [ { "name": "Registered boundary experiment", "experiment": "Predefine one pathogen, a susceptible sporadic population and an early time window, then follow CNS pathogen-positive and negative biomarker-negative participants with validated paired fluid/barrier and amyloid/tau measures; apply a selective prevention/removal instrument where feasible.", "readout": "Biomarker-confirmed incident AD, functional trajectory and CNS mediator clearance before conversion", "critical_control": "Extraction blanks/spike-ins, active systemic versus CNS infection, immune off-target effects, pathogen-negative participants and negative-control diagnoses", "supporting_result": "Selective antecedent CNS clearance changes conversion with measured mediation and a replicated prespecified attributable fraction", "falsifying_result": "Clearance affects infection but not AD conversion, or CNS positivity begins only after lesions/barrier dysfunction" } ], "knowledge_gaps": [ { "name": "Gap 1", "statement": "A quantitative substantial-fraction definition with a representative denominator.", "relevance": "Limits mechanism identification or scope." }, { "name": "Gap 2", "statement": "Validated active CNS pathogen assays and prospective prelesion tissue/fluid timing.", "relevance": "Limits mechanism identification or scope." }, { "name": "Gap 3", "statement": "Specific vaccination mediation separated from heterologous immunity and vascular effects.", "relevance": "Limits mechanism identification or scope." }, { "name": "Gap 4", "statement": "Safe prelesion antiviral prevention with demonstrated CNS target engagement.", "relevance": "Limits mechanism identification or scope." }, { "name": "Gap 5", "statement": "Physiologic Aβ antimicrobial loss/rescue and long-term injury/protection tradeoffs.", "relevance": "Limits mechanism identification or scope." }, { "name": "Gap 6", "statement": "Independent laboratory replication with contamination, integration and host-genotype controls.", "relevance": "Limits mechanism identification or scope." } ], "review_metadata": { "review_date": "2026-10-05", "reviewer": "Codex", "evidence_base_note": "65 primary reports; literature cutoff 2026-10-05; source examination UTC date 2026-10-06; bounded critical review, not exhaustive systematic review.", "literature_tools_available": true, "literature_tools_note": "Life Sciences Literature PubMed/Europe PMC; signed-in Consensus browser discovery and attempted indexed full-text extraction. Successful passages and failures are reconciled with original sections where available; see case reconciliation. Zero Consensus API calls.", "skill_version": "5.3", "validator_run": "exact archived v5.3 validator 2.3; see validator.txt", "validator_warnings_addressed": "Phenomenon entry was restated as the preregistered causal claim. No real phenomenon is labelled refuted; warning is explicitly justified.", "consensus_consistency_audit": "2026-10-09; supplementary provenance/source reconciliation; original grading retained; prior grades visible." }, "is_calibration_entry": { "value": false, "entry_role": "not_calibration", "blind_graded": null, "completed_blinded_calibration": false, "expected_band_sealed_at": "", "target_sha256": "", "target_authorship": "not applicable", "target_author_saw_review": null, "future_run_status": "not prepared", "unblinded_reason": "Ranking categorical verdict and index guidance were visible. No completed blinded calibration claimed." }, "upper_ladder_check": { "final_level_below_zeta": true, "equivalents_considered": [ { "kind": "mendelian_randomization", "available": false, "why_not_sufficient": "Herpes-proxy MR, APP human protection, three national vaccine natural experiments and randomized antimicrobial clinical outcomes were examined. Genetics do not instrument antecedent CNS invasion; vaccines measure recorded dementia; post-onset antivirals lack selected CNS-replication mediation and fail benefit. They remain credible upper-ladder candidates without proving SC3. No unethical infection RCT is required." }, { "kind": "natural_experiment", "available": true, "why_not_sufficient": "Herpes-proxy MR, APP human protection, three national vaccine natural experiments and randomized antimicrobial clinical outcomes were examined. Genetics do not instrument antecedent CNS invasion; vaccines measure recorded dementia; post-onset antivirals lack selected CNS-replication mediation and fail benefit. They remain credible upper-ladder candidates without proving SC3. No unethical infection RCT is required." }, { "kind": "dose_response_across_populations", "available": false, "why_not_sufficient": "Herpes-proxy MR, APP human protection, three national vaccine natural experiments and randomized antimicrobial clinical outcomes were examined. Genetics do not instrument antecedent CNS invasion; vaccines measure recorded dementia; post-onset antivirals lack selected CNS-replication mediation and fail benefit. They remain credible upper-ladder candidates without proving SC3. No unethical infection RCT is required." }, { "kind": "withdrawal_rechallenge", "available": false, "why_not_sufficient": "Herpes-proxy MR, APP human protection, three national vaccine natural experiments and randomized antimicrobial clinical outcomes were examined. Genetics do not instrument antecedent CNS invasion; vaccines measure recorded dementia; post-onset antivirals lack selected CNS-replication mediation and fail benefit. They remain credible upper-ladder candidates without proving SC3. No unethical infection RCT is required." }, { "kind": "therapeutic_perturbation_hard_endpoint", "available": false, "why_not_sufficient": "Herpes-proxy MR, APP human protection, three national vaccine natural experiments and randomized antimicrobial clinical outcomes were examined. Genetics do not instrument antecedent CNS invasion; vaccines measure recorded dementia; post-onset antivirals lack selected CNS-replication mediation and fail benefit. They remain credible upper-ladder candidates without proving SC3. No unethical infection RCT is required." } ], "convergence_present": true, "cap_reapplied_to_convergent_set": false }, "provenance_header": { "sources_total": 65, "claims_total": 70, "claims_verified": 70, "claims_unverified": 0, "claims_contradicted": 0, "tier_a_sources": 65, "generated_by": "Codex; HSEF v5.3", "gate_passed": true }, "claims": [ { "id": "C1", "text": "Brain HSV detection interacted with APOE4 in a small autopsy case-control series. HSV occurred in controls and some AD brains were negative; late tissue and wide intervals do not establish antecedent CNS necessity.", "carries_number": true, "load_bearing_for": [ "SC2", "SC3" ], "source_ns": [ 1 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C2", "text": "In-situ PCR found plaque-associated HSV DNA in AD and aged normal brains, with different localization fractions. Plaque colocalization cannot order infection before deposition or distinguish entrapment from initiation; small autopsy assay samples constrain scope.", "carries_number": false, "load_bearing_for": [ "SC2" ], "source_ns": [ 2 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C3", "text": "Intrathecal HSV antibodies were frequent in both AD and controls without significant group difference. Antibody indices imply prior intrathecal response rather than contemporary viable virus or disease-specific initiation; small sample limits negative inference.", "carries_number": false, "load_bearing_for": [ "SC2", "SC3" ], "source_ns": [ 3 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C4", "text": "Baseline HSV IgM predicted incident AD in a fourteen-year dementia-free cohort; IgG did not significantly predict AD. Peripheral IgM is not a CNS mediator and prediagnosis is not prelesion; measured confounding control does not isolate an initiating infection.", "carries_number": false, "load_bearing_for": [ "SC3", "SC4" ], "source_ns": [ 4 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C5", "text": "Swedish baseline HSV IgM predicted later AD whereas IgG did not. Age/sex-adjusted association and reactivation proxies cannot locate infection or demonstrate necessity; preclinical AD can precede sampling.", "carries_number": false, "load_bearing_for": [ "SC3", "SC4" ], "source_ns": [ 5 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C6", "text": "Bordeaux-3C HSV antibody proxies associated with AD in APOE4 carriers but not noncarriers. Wide genotype-stratum intervals and peripheral exposure do not verify a necessary CNS pathway; cohort estimates do not identify an etiologic fraction.", "carries_number": true, "load_bearing_for": [ "SC3", "SC4" ], "source_ns": [ 6 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C7", "text": "Rotterdam HSV IgG associated with cognitive decline but not incident dementia or AD. IgG lifetime exposure is insensitive to reactivation and CNS infection; null incidence does not exclude a specific susceptibility subgroup.", "carries_number": false, "load_bearing_for": [ "SC3", "SC4" ], "source_ns": [ 7 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C8", "text": "Herpes-proxy Mendelian analyses gave heterogeneous results including positive mononucleosis and inverse shingles associations. Exposure instruments and family-history validation do not represent CNS invasion; pleiotropy and limited power restrict pathogen-specific causal attribution.", "carries_number": false, "load_bearing_for": [ "SC3" ], "source_ns": [ 8 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C9", "text": "Multicohort postmortem network analysis reported HHV6A/7 enrichment and regulatory associations with APP pathways. Original Methods use species-unique 31mers, sensitive local mapping and batch/cell covariates, yet independent reanalysis challenges assignment specificity. MSBB/ROSMAP shared archives and inherited integration complicate inference; modelled regulatory direction is not observed infection-before-AD.", "carries_number": true, "load_bearing_for": [ "SC2", "SC3" ], "source_ns": [ 9 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. Selected body sections: 3:STAR Methods:paragraph14, 3:STAR Methods:paragraph15, 3:STAR Methods:paragraph16, 3:STAR Methods:paragraph17, 3:STAR Methods:paragraph18, 3:STAR Methods:paragraph24, 3:STAR Methods:paragraph20, 3:STAR Methods:paragraph21, 3:STAR Methods:paragraph22, 3:STAR Methods:paragraph23. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C10", "text": "Independent sequence screening and HHV6 PCR across brain repositories found little AD specificity. Original Methods/Results include PathSeq and triplex ddPCR, independent positive retesting and near-one-copy-per-cell integration patterns. MSBB/ROSMAP overlap positive reports; DNA assays add orthogonality but do not establish lifetime absence or a cleared early hit.", "carries_number": true, "load_bearing_for": [ "SC2" ], "source_ns": [ 10 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. Selected body sections: 1:Results::paragraph2, 1:Results::paragraph3, 1:Results::paragraph5, 3:STAR Methods::paragraph2, 3:STAR Methods::paragraph3. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C11", "text": "Alternative reanalysis failed to reproduce HHV7 reads and found HHV6A in few high-ranked original samples, identifying low-specificity mapping. Same data are an assay-specific challenge rather than independent patients; negative reanalysis does not prove lifetime absence of infection.", "carries_number": true, "load_bearing_for": [ "SC2" ], "source_ns": [ 11 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C12", "text": "HHV6 antibodies, avidity and regional volumes did not distinguish AD, aMCI and controls. Serology does not detect localized CNS infection and cannot rule out every viral role despite the authors' stronger interpretation.", "carries_number": true, "load_bearing_for": [ "SC2", "SC3" ], "source_ns": [ 12 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C13", "text": "Chlamydia DNA, culture, transcripts and microscopy were positive in many AD brains versus controls. Small late-autopsy series from one programme cannot order infection before lesions; independent failures of detection remain material.", "carries_number": false, "load_bearing_for": [ "SC2" ], "source_ns": [ 13 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C14", "text": "Follow-up Chlamydia brain PCR and viable/transcriptional evidence extended the original positive programme. The abstract reports inconsistent AD sample denominators; no precise prevalence is carried forward without body resolution. Shared programme is not independent causal replication.", "carries_number": false, "load_bearing_for": [ "SC2" ], "source_ns": [ 14 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C15", "text": "Nested PCR and immunostaining in twenty AD cases failed to detect Chlamydia. Paraffin processing and limited tissue can reduce sensitivity; failure constrains common detectable presence, not every earlier exposure.", "carries_number": false, "load_bearing_for": [ "SC2" ], "source_ns": [ 15 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C16", "text": "Repeated PCR across up to six regions and culture failed unequivocal Chlamydia detection in AD/control brains. Fifteen cases and five controls are small; validated negative contemporary tissue does not test a prespecified cleared early-hit model.", "carries_number": false, "load_bearing_for": [ "SC2" ], "source_ns": [ 16 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C17", "text": "Periodontal LPS immunostaining/immunoblotting identified four of ten AD brains and no controls. A virulence component is not proof of live CNS infection or entry before AD; surface adsorption and small tissue samples constrain specificity.", "carries_number": false, "load_bearing_for": [ "SC2" ], "source_ns": [ 17 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C18", "text": "Periodontal antibody differences preceded cognitive conversion in the Kentucky cohort. The significant taxa were Fusobacterium and Prevotella, not a uniquely demonstrated Pg CNS infection; antibody and oral-health confounding remain.", "carries_number": false, "load_bearing_for": [ "SC3", "SC4" ], "source_ns": [ 18 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C19", "text": "NHANES periodontal depth and multi-taxon antibody composites associated with later claims-based dementia and AD outcomes. Composite exposures, socioeconomic care and claims diagnosis cannot identify a necessary CNS species or fraction.", "carries_number": false, "load_bearing_for": [ "SC3", "SC4" ], "source_ns": [ 19 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C20", "text": "Oral Treponema PCR and antigens were enriched in AD cortex and detected in some controls and trigeminal tissue. Cross-sectional localization is compatible with several entry directions; late presence does not prove initiating necessity.", "carries_number": false, "load_bearing_for": [ "SC2" ], "source_ns": [ 20 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C21", "text": "Multiple-target PCR and serology failed to support Borrelia involvement in examined AD samples. Small brain series cannot exclude every pathogen or cleared early exposure; this constrains the specific Borrelia claim.", "carries_number": false, "load_bearing_for": [ "SC2" ], "source_ns": [ 21 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C22", "text": "Fungal staining and sequencing reported multiple fungal species in AD CNS regions versus controls. Low-biomass tissue, antibody cross-reactivity, reagent contamination and late entry need independent resolution; reported material is not antecedent necessity.", "carries_number": false, "load_bearing_for": [ "SC2" ], "source_ns": [ 22 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C23", "text": "CD83 microglia, HCMV and IgG4 cross-tissue associations were replicated, and infected organoids showed AD-like changes. Original Methods identify selected 34 cortical, 25 colon and eight vagal Banner specimens, plus an AD-only ROSMAP validation subset; antibody peptide/positive-negative tissue controls are present. Organoid experiments use dissociated cells with imposed HCMV and 48-hour assays. Cross-tissue direction, viable human CNS infection and initiation remain unproved.", "carries_number": true, "load_bearing_for": [ "SC2", "SC3" ], "source_ns": [ 23 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. Selected body sections: 1:METHODS:paragraph13, 1:METHODS:paragraph14, 1:METHODS:paragraph9, 1:METHODS:paragraph12, 1:METHODS:paragraph29, 2:RESULTS:paragraph0, 2:RESULTS:paragraph1. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C24", "text": "Welsh birth-date eligibility discontinuity supported reduced or delayed dementia diagnosis after live zoster vaccination. Original Methods define dementia of any cause, distinguish eligibility from instrument-scaled complier receipt effects, and consider clinical/subclinical VZV and pathogen-independent immune effects as compatible exploratory mechanisms. No CNS-pathogen-mediated biomarker-confirmed AD fraction is estimated.", "carries_number": false, "load_bearing_for": [ "SC3" ], "source_ns": [ 24 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. Selected body sections: 6:Explorations of the effect mechanism:paragraph0, 6:Explorations of the effect mechanism:paragraph12, 8:Methods:paragraph8, 8:Methods:paragraph11, 8:Methods:paragraph12. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C25", "text": "Australian birth-date vaccine eligibility reduced recorded dementia diagnoses with balanced baseline health and preventive-care controls. The eligibility effect is not the receipt effect; primary-care diagnoses lack AD/CNS mediation and the local age threshold limits transfer.", "carries_number": false, "load_bearing_for": [ "SC3" ], "source_ns": [ 25 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C26", "text": "Canadian eligibility discontinuities and cross-province comparisons supported delayed/reduced dementia diagnoses after live zoster vaccination. Multiple analyses share a Canadian source population; exposure uptake is separately surveyed and mechanism remains unspecified.", "carries_number": false, "load_bearing_for": [ "SC3" ], "source_ns": [ 26 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C27", "text": "Welsh eligibility analysis found effects on MCI diagnoses and dementia-related deaths after diagnosis. Same Welsh programme as prior report; nonspecific dementia effects and postdiagnosis benefit are incompatible with assuming only an initiation pathway.", "carries_number": false, "load_bearing_for": [ "SC3" ], "source_ns": [ 27 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C28", "text": "The US vaccine transition comparison associated recombinant vaccination with greater dementia-diagnosis-free time than live vaccination. Time-period/formulation changes and residual care differences remain; diagnosis-free time is not an incidence-risk percentage or direct CNS mediator.", "carries_number": false, "load_bearing_for": [ "SC3" ], "source_ns": [ 28 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C29", "text": "AS01-adjuvanted zoster and RSV vaccines associated similarly with lower short-term dementia risk. Propensity matching does not prove an adjuvant mechanism; different pathogens and short latency challenge unique CNS-infection attribution.", "carries_number": true, "load_bearing_for": [ "SC3" ], "source_ns": [ 29 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C30", "text": "Large claims cohorts associated recombinant vaccine dose and antiviral exposure with lower dementia incidence. Healthy-user, treatment indication and diagnostic bias remain; no biomarker-defined AD or CNS infection mediates the reported association.", "carries_number": false, "load_bearing_for": [ "SC3" ], "source_ns": [ 30 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C31", "text": "VALAD valacyclovir worsened the primary cognitive outcome versus placebo and did not improve amyloid/tau PET in early symptomatic HSV-seropositive disease. Serology does not demonstrate CNS active replication; post-onset failure constrains this treatment/model, not a precisely specified cleared early initiating hit.", "carries_number": false, "load_bearing_for": [ "SC3" ], "source_ns": [ 31 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C32", "text": "VALMCI found no amyloid-PET, cognitive or functional benefit over twelve months in amyloid-positive HSV-seropositive MCI. Small pilot intervals admit limited effects; MCI with established amyloid is not prelesion prevention and active CNS infection was not the selection gate.", "carries_number": false, "load_bearing_for": [ "SC3" ], "source_ns": [ 32 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C33", "text": "Open VALZ pilot established short-term valacyclovir feasibility and CSF drug exposure with unchanged tau/NfL and improved MMSE. Uncontrolled four-week change is vulnerable to practice effects; CNS drug exposure is not measured viral suppression or disease modification.", "carries_number": false, "load_bearing_for": [ "SC3" ], "source_ns": [ 33 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C34", "text": "Antibiotic combination reduced six-month cognitive decline in a small randomized trial but not significantly at twelve months. Chlamydia tests did not change, and antibiotics have non-antimicrobial effects; clinical signal does not isolate CNS infection initiation.", "carries_number": false, "load_bearing_for": [ "SC3" ], "source_ns": [ 34 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C35", "text": "DARAD failed cognitive/functional benefit from doxycycline/rifampin and showed deterioration with individual agents. Post-onset treatment and pathogen-unselected participants limit etiologic inference; does not exclude a prespecified earlier infection event.", "carries_number": false, "load_bearing_for": [ "SC3" ], "source_ns": [ 35 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C36", "text": "Taiwan claims associated clinically diagnosed HSV with dementia and antiviral prescriptions with a very large lower hazard. Indication, care access, time assignment and diagnosis biases can distort large effects; neither CNS infection nor AD biomarkers were the endpoint.", "carries_number": false, "load_bearing_for": [ "SC3" ], "source_ns": [ 36 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C37", "text": "Dutch pharmacy exposure associated antivirals with markedly lower subsequent AD-drug initiation. Medication initiation is not confirmed AD incidence; unmeasured indication, time and care-selection bias remain, and no CNS mediator was measured.", "carries_number": false, "load_bearing_for": [ "SC3" ], "source_ns": [ 37 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C38", "text": "Imposed HSV infection increased cellular secretases/Aβ and brain Aβ deposits. Induced infection establishes capability, not native sporadic initiation, selective vulnerability or an etiologic human fraction.", "carries_number": false, "load_bearing_for": [ "SC1", "SC3" ], "source_ns": [ 38 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C39", "text": "HSV infection induced AD-associated tau phosphorylation and kinase activity in cells. AD-like epitopes under acute infection are not complete human AD causality or necessary initiating infection.", "carries_number": false, "load_bearing_for": [ "SC3" ], "source_ns": [ 39 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C40", "text": "Replication-restricted viral strains and antivirals separated infection stages producing Aβ and phosphorylated tau. Aβ and tau had different replication dependencies; acute culture rescue cannot substitute for disease modification, as later human trials demonstrate.", "carries_number": false, "load_bearing_for": [ "SC1", "SC3" ], "source_ns": [ 40 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C41", "text": "Repeated thermal reactivation of imposed HSV produced CNS replication, accumulated pathology and persistent cognitive deficits. Combined infection/stress and induced cycles do not demonstrate naturally initiated sporadic human AD or a necessity fraction.", "carries_number": false, "load_bearing_for": [ "SC3", "SC4" ], "source_ns": [ 41 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C42", "text": "Imposed HSV in engineered human neural tissue produced plaque-like formations, inflammation and reduced function without added Aβ. Exogenous virus remains an imposed trigger; immature tissue and injury responses do not establish a human etiologic fraction.", "carries_number": false, "load_bearing_for": [ "SC1", "SC3" ], "source_ns": [ 42 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C43", "text": "VZV alone induced inflammation without Aβ/tau but reactivated latent HSV with AD-like changes. Culture-specific reactivation supports an indirect possibility, not proven CNS VZV/HSV mediation of vaccination effects.", "carries_number": false, "load_bearing_for": [ "SC3" ], "source_ns": [ 43 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C44", "text": "Controlled injury reactivated latent HSV and increased AD-like changes; mock infection and IL1beta blockade separated contributing pathways. The initiating event in this model includes injury and imposed latent virus; pathway blockade in monolayers does not establish native human CNS necessity.", "carries_number": true, "load_bearing_for": [ "SC3", "SC4" ], "source_ns": [ 44 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C45", "text": "Human HSV-associated proteins and organoid cGAS-STING-TBK1 perturbations linked phosphorylation with protection against infected-neuron death. Protective acute p-tau response is not beneficial chronic tangle deposition; postmortem association and induced infection do not order AD initiation.", "carries_number": true, "load_bearing_for": [ "SC1", "SC2" ], "source_ns": [ 45 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C46", "text": "HSV-associated Aβ localization differed between 2D infected cells and 3D surrounding cells. Architecture-dependent induction is not uniform direct viral amyloid seeding; developmental organoids cannot establish clinical necessity.", "carries_number": true, "load_bearing_for": [ "SC1", "SC3" ], "source_ns": [ 46 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C47", "text": "High-inoculum HHV6A microglia infection increased Aβ42, activation and phosphorylated tau secretion. Imposed infection and immortalized/monocyte-derived microglia do not show endogenous neurodegeneration or human initiating infection.", "carries_number": true, "load_bearing_for": [ "SC1", "SC3" ], "source_ns": [ 47 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C48", "text": "Human gingipain associations and imposed oral infection/inhibitor experiments supported a causal Pg injury pathway in mice. Tissue association and pharmacologic rescue in imposed infection do not establish naturally necessary CNS Pg infection; systemic inflammation and off-target effects require controls.", "carries_number": false, "load_bearing_for": [ "SC2", "SC3" ], "source_ns": [ 48 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C49", "text": "Chronic imposed oral Pg in young wild-type mice produced brain microbial signals, inflammation, degenerating-neuron staining and Aβ/tau changes. Repeated exposure and small groups do not isolate CNS infection from systemic effects; NeuN expression alone is not cell death, though FluoroJade adds injury evidence.", "carries_number": false, "load_bearing_for": [ "SC3", "SC4" ], "source_ns": [ 49 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C50", "text": "Oral infection did not accelerate amyloid in CRND8 mice; live intracerebral Pg increased deposition whereas heat-killed inoculation did not. Direct brain injection bypasses entry/barrier questions; null oral effects are context-specific and do not exclude other pathogens or strains.", "carries_number": true, "load_bearing_for": [ "SC3" ], "source_ns": [ 50 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C51", "text": "Pg periodontitis increased BBB permeability, glial IFITM3, amyloid and cognitive impairment in wild-type and APP/PS1 mice. The abstract does not document selective IFITM3 dependency/rescue; barrier disruption can precede or mediate microbial entry rather than CNS infection necessarily initiating AD.", "carries_number": true, "load_bearing_for": [ "SC3", "SC4" ], "source_ns": [ 51 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C52", "text": "An AD-brain Chlamydia isolate induced persistent olfactory infection and increasing Aβ-reactive deposits in BALB/c mice. Imposed infection and plaque-like staining do not establish a complete AD trajectory or naturally necessary human infection.", "carries_number": false, "load_bearing_for": [ "SC3", "SC4" ], "source_ns": [ 52 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C53", "text": "Independent Chlamydia model found Aβ aggregates in infected, mock and untreated mice with unlike transgenic plaque morphology. Strain and assay differences limit an absolute negative conclusion; the experiment rejects unqualified infection-specific plaque induction in this setting.", "carries_number": false, "load_bearing_for": [ "SC3" ], "source_ns": [ 53 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C54", "text": "Laboratory Chlamydia infection caused limited olfactory persistence and transient amyloid changes that resolved as antigen burden fell. Strain-specific resolution differs from sustained human AD and does not demonstrate pathogen requirement for a sporadic fraction.", "carries_number": false, "load_bearing_for": [ "SC3", "SC4" ], "source_ns": [ 54 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C55", "text": "Intranasal Chlamydia rapidly invaded peripheral nerves/CNS and produced adjacent Aβ changes; nasal injury altered peripheral infection. Capability to traverse nerves is not a human incidence-risk measurement; imposed dose and injury do not establish entry before native AD/barrier lesions.", "carries_number": false, "load_bearing_for": [ "SC3", "SC4" ], "source_ns": [ 55 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C56", "text": "Low-grade candidemia induced glial granulomas, APP/Aβ-associated clearance and transient memory deficits, while Aβ enhanced antifungal phagocytosis. Acute clearing cerebritis is not chronic sporadic AD; APP and microglial effects do not isolate beneficial plaque deposition over decades.", "carries_number": false, "load_bearing_for": [ "SC1", "SC3" ], "source_ns": [ 56 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C57", "text": "Whole-genome screening found partial HHV6 integration signals enriched in synucleinopathy cohorts rather than AD. Blood/genomic integration is not active CNS infection; low PathSeq signals need orthogonal validation and do not determine lifetime exposure.", "carries_number": true, "load_bearing_for": [ "SC2" ], "source_ns": [ 57 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C58", "text": "CSF sequencing with spike-ins and meningitis controls found negligible bacterial content consistent with contamination rather than a resident microbiome. CSF negatives do not exclude focal tissue infection or prior cleared infection; sequencing limits must remain prespecified.", "carries_number": false, "load_bearing_for": [ "SC2" ], "source_ns": [ 58 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C59", "text": "Terminal systemic infection and AD associated with distinct vessel-associated microglial activation and vascular/barrier markers. Terminal infection and cross-sectional barrier changes are progression/confounding evidence, not infection-before-lesion order.", "carries_number": false, "load_bearing_for": [ "SC2", "SC4" ], "source_ns": [ 59 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C60", "text": "Paired UK Biobank plasma before/after COVID showed AD-associated biomarker shifts, larger with vulnerability/severity. Plasma biomarkers and post-hoc matching do not establish incident AD or direct CNS invasion; systemic inflammation is a viable alternative.", "carries_number": false, "load_bearing_for": [ "SC3", "SC4" ], "source_ns": [ 60 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C61", "text": "APP A673T protection paired with reduced beta cleavage provides a human molecular alternative to obligatory infection initiation. Rare genetic protection does not prove pathogens never contribute; no direct pathogen measurement or selective antimicrobial mediator was tested.", "carries_number": true, "load_bearing_for": [ "SC3" ], "source_ns": [ 61 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C62", "text": "Synthetic Aβ and AD homogenates inhibited microbes; Aβ immunodepletion reduced homogenate antimicrobial activity. Original Results find predominantly bacteriostatic Aβ effects with later growth recovery; Methods note diffusion/aggregation problems in agar assays and pooled homogenate immunodepletion. Concentration/aggregation and APP-containing antibody specificity limit physiological interpretation; chronic plaques and initiating infection are separate claims.", "carries_number": false, "load_bearing_for": [ "SC1" ], "source_ns": [ 62 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. Selected body sections: 1:Results:paragraph2, 1:Results:paragraph6, 3:Materials and Methods:paragraph6, 3:Materials and Methods:paragraph12. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C63", "text": "Aβ-expressing mouse/worm systems showed microbial protection, with fibril-associated entrapment after imposed brain challenge. Transgenes and intracerebral challenge establish bounded antimicrobial competence; neither protective deposition in sporadic AD nor a necessary initiating pathogen follows.", "carries_number": false, "load_bearing_for": [ "SC1" ], "source_ns": [ 63 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C64", "text": "HSV induced EV-associated phosphorylated tau and transfer into recipient neurons, including tau-null recipients. Uptake into tau-null cells is not recipient-templated seeding; acute infection, overexpressed tagged tau and transfer do not establish progressive native human AD.", "carries_number": false, "load_bearing_for": [ "SC3" ], "source_ns": [ 64 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "C65", "text": "Matched US claims linked diagnosed HSV1 history with AD and antivirals with moderately lower risk. Clinically coded HSV is a small selected subset of common infection; residual care/indication bias and absent CNS mediator prevent causal fraction attribution.", "carries_number": true, "load_bearing_for": [ "SC3" ], "source_ns": [ 65 ], "verification": "verified", "verified_against": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "verified_on": "2026-10-06", "note": "" }, { "id": "CSC1", "text": "Synthetic/homogenate specificity and mouse/worm infection outcomes support antimicrobial or entrapment competence in defined models. Acute host protection is credited without equating it with beneficial chronic human plaque deposition; physiologic exposure and chronic tradeoffs prevent stronger broad inference.", "carries_number": false, "load_bearing_for": [ "SC1" ], "source_ns": [ 38, 40, 42, 45, 46, 47, 56, 62, 63 ], "verification": "verified", "verified_against": "Synthesis of examined primary result/limit cards; framework level is adjudication.", "verified_on": "2026-10-06", "note": "" }, { "id": "CSC2", "text": "Several pathogens or components are reported in AD brains, but reproducibility and specificity differ. HSV controls, HHV read-mapping/DDPCR challenges, failed Chlamydia/Borrelia replication, inherited integration and contamination remain. For the registered contamination-controlled human enrichment scope, associations do not establish a reproducible initiating burden.", "carries_number": false, "load_bearing_for": [ "SC2" ], "source_ns": [ 1, 2, 3, 9, 10, 11, 12, 13, 14, 15, 16, 17, 20, 21, 22, 23, 45, 48, 57, 58, 59 ], "verification": "verified", "verified_against": "Synthesis of examined primary result/limit cards; framework level is adjudication.", "verified_on": "2026-10-06", "note": "" }, { "id": "CSC3", "text": "Native human necessity and an attributable substantial fraction have not been demonstrated. Mechanistic infection models and vaccine natural experiments exceed mere colocalization, but they do not locate the causal mediator in CNS infection before AD. Post-onset valacyclovir failure is bounded counterevidence to ongoing treatable HSV replication, not proof against every prespecified earlier hit.", "carries_number": false, "load_bearing_for": [ "SC3" ], "source_ns": [ 1, 3, 4, 5, 6, 7, 8, 9, 12, 18, 19, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 60, 61, 64, 65 ], "verification": "verified", "verified_against": "Synthesis of examined primary result/limit cards; framework level is adjudication.", "verified_on": "2026-10-06", "note": "" }, { "id": "CSC4", "text": "Prediagnostic serology and repeated infection models offer temporal clues, yet peripheral positivity and clinical diagnosis precede neither proven BBB failure nor first AD lesions. Late autopsies, tissue localization and plasma biomarker shifts do not directly order CNS pathogen entry before preclinical pathology.", "carries_number": false, "load_bearing_for": [ "SC4" ], "source_ns": [ 4, 5, 6, 7, 18, 19, 41, 44, 49, 51, 52, 54, 55, 59, 60 ], "verification": "verified", "verified_against": "Synthesis of examined primary result/limit cards; framework level is adjudication.", "verified_on": "2026-10-06", "note": "" }, { "id": "CH", "text": "Infections can produce AD-like injury and vaccination can reduce dementia diagnoses; necessary CNS-pathogen initiation of a substantial sporadic AD fraction remains unestablished.", "carries_number": false, "load_bearing_for": [ "SC3" ], "source_ns": [ 10, 24, 31, 32, 48, 63 ], "verification": "verified", "verified_against": "Bounded synthesis of examined sources; score is adjudication.", "verified_on": "2026-10-06", "note": "" } ], "citation_ledger": [ { "n": 1, "citation": "Itzhaki RF, Lin WR, Shang D et al. Herpes simplex virus type 1 in brain and risk of Alzheimer's disease. Lancet (London, England). 1997.", "tier": "A", "kind": "primary", "pmid": "9014911", "doi": "10.1016/S0140-6736(96)10149-5", "url": "https://pubmed.ncbi.nlm.nih.gov/9014911/", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID9014911", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "carries_claims": [ "C1", "CSC2", "CSC3" ] }, { "n": 2, "citation": "Wozniak MA, Mee AP, Itzhaki RF et al. Herpes simplex virus type 1 DNA is located within Alzheimer's disease amyloid plaques. The Journal of pathology. 2009.", "tier": "A", "kind": "primary", "pmid": "18973185", "doi": "10.1002/path.2449", "url": "https://pubmed.ncbi.nlm.nih.gov/18973185/", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID18973185", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "carries_claims": [ "C2", "CSC2" ] }, { "n": 3, "citation": "Wozniak MA, Shipley SJ, Combrinck M et al. Productive herpes simplex virus in brain of elderly normal subjects and Alzheimer's disease patients. Journal of medical virology. 2005.", "tier": "A", "kind": "primary", "pmid": "15602731", "doi": "10.1002/jmv.20271", "url": "https://pubmed.ncbi.nlm.nih.gov/15602731/", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID15602731", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "carries_claims": [ "C3", "CSC2", "CSC3" ] }, { "n": 4, "citation": "Letenneur L, Pérès K, Fleury H et al. Seropositivity to herpes simplex virus antibodies and risk of Alzheimer's disease: a population-based cohort study. PloS one. 2008.", "tier": "A", "kind": "primary", "pmid": "18982063", "doi": "10.1371/journal.pone.0003637", "url": "https://pubmed.ncbi.nlm.nih.gov/18982063/", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID18982063", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "carries_claims": [ "C4", "CSC3", "CSC4" ] }, { "n": 5, "citation": "Lövheim H, Gilthorpe J, Adolfsson R et al. Reactivated herpes simplex infection increases the risk of Alzheimer's disease. Alzheimer's & dementia : the journal of the Alzheimer's Association. 2015.", "tier": "A", "kind": "primary", "pmid": "25043910", "doi": "10.1016/j.jalz.2014.04.522", "url": "https://pubmed.ncbi.nlm.nih.gov/25043910/", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID25043910", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "carries_claims": [ "C5", "CSC3", "CSC4" ] }, { "n": 6, "citation": "Linard M, Letenneur L, Garrigue I et al. Interaction between APOE4 and herpes simplex virus type 1 in Alzheimer's disease. Alzheimer's & dementia : the journal of the Alzheimer's Association. 2020.", "tier": "A", "kind": "primary", "pmid": "31914220", "doi": "10.1002/alz.12008", "url": "https://pubmed.ncbi.nlm.nih.gov/31914220/", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID31914220", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "carries_claims": [ "C6", "CSC3", "CSC4" ] }, { "n": 7, "citation": "Murphy MJ, Fani L, Ikram MK et al. Herpes simplex virus 1 and the risk of dementia: a population-based study. Scientific reports. 2021.", "tier": "A", "kind": "primary", "pmid": "33888766", "doi": "10.1038/s41598-021-87963-9", "url": "https://pubmed.ncbi.nlm.nih.gov/33888766/", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID33888766", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "carries_claims": [ "C7", "CSC3", "CSC4" ] }, { "n": 8, "citation": "Huang SY, Yang YX, Kuo K et al. Herpesvirus infections and Alzheimer's disease: a Mendelian randomization study. Alzheimer's research & therapy. 2021.", "tier": "A", "kind": "primary", "pmid": "34560893", "doi": "10.1186/s13195-021-00905-5", "url": "https://pubmed.ncbi.nlm.nih.gov/34560893/", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID34560893", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "carries_claims": [ "C8", "CSC3" ] }, { "n": 9, "citation": "Readhead B, Haure-Mirande JV, Funk CC et al. Multiscale Analysis of Independent Alzheimer's Cohorts Finds Disruption of Molecular, Genetic, and Clinical Networks by Human Herpesvirus. Neuron. 2018.", "tier": "A", "kind": "primary", "pmid": "29937276", "doi": "10.1016/j.neuron.2018.05.023", "url": "https://pubmed.ncbi.nlm.nih.gov/29937276/", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "AMPAD-MSBB-ROSMAP-Mayo", "access_depth": "full_text_partial", "access_note": "Complete primary abstract and linked-status metadata examined. Selected body sections: 3:STAR Methods:paragraph14, 3:STAR Methods:paragraph15, 3:STAR Methods:paragraph16, 3:STAR Methods:paragraph17, 3:STAR Methods:paragraph18, 3:STAR Methods:paragraph24, 3:STAR Methods:paragraph20, 3:STAR Methods:paragraph21, 3:STAR Methods:paragraph22, 3:STAR Methods:paragraph23. No complete-paper or supplement audit claimed.", "carries_claims": [ "C9", "CSC2", "CSC3" ] }, { "n": 10, "citation": "Allnutt MA, Johnson K, Bennett DA et al. Human Herpesvirus 6 Detection in Alzheimer's Disease Cases and Controls across Multiple Cohorts. Neuron. 2020.", "tier": "A", "kind": "primary", "pmid": "31983538", "doi": "10.1016/j.neuron.2019.12.031", "url": "https://pubmed.ncbi.nlm.nih.gov/31983538/", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "AMPAD-MSBB-ROSMAP-plus-JHBRC", "access_depth": "full_text_partial", "access_note": "Complete primary abstract and linked-status metadata examined. Selected body sections: 1:Results::paragraph2, 1:Results::paragraph3, 1:Results::paragraph5, 3:STAR Methods::paragraph2, 3:STAR Methods::paragraph3. No complete-paper or supplement audit claimed.", "carries_claims": [ "C10", "CSC2", "CH" ] }, { "n": 11, "citation": "Chorlton SD et al. Reanalysis of Alzheimer's brain sequencing data reveals absence of purported HHV6A and HHV7. Journal of bioinformatics and computational biology. 2020.", "tier": "A", "kind": "primary", "pmid": "32336252", "doi": "10.1142/S0219720020500122", "url": "https://pubmed.ncbi.nlm.nih.gov/32336252/", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "AMPAD-MSBB-reanalysis", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "carries_claims": [ "C11", "CSC2" ] }, { "n": 12, "citation": "Agostini S, Mancuso R, Baglio F et al. Lack of evidence for a role of HHV-6 in the pathogenesis of Alzheimer's disease. Journal of Alzheimer's disease : JAD. 2016.", "tier": "A", "kind": "primary", "pmid": "26444787", "doi": "10.3233/JAD-150464", "url": "https://pubmed.ncbi.nlm.nih.gov/26444787/", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID26444787", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "carries_claims": [ "C12", "CSC2", "CSC3" ] }, { "n": 13, "citation": "Balin BJ, Gérard HC, Arking EJ et al. Identification and localization of Chlamydia pneumoniae in the Alzheimer's brain. Medical microbiology and immunology. 1998.", "tier": "A", "kind": "primary", "pmid": "9749980", "doi": "10.1007/s004300050071", "url": "https://pubmed.ncbi.nlm.nih.gov/9749980/", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID9749980", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "carries_claims": [ "C13", "CSC2" ] }, { "n": 14, "citation": "Gérard HC, Dreses-Werringloer U, Wildt KS et al. Chlamydophila (Chlamydia) pneumoniae in the Alzheimer's brain. FEMS immunology and medical microbiology. 2006.", "tier": "A", "kind": "primary", "pmid": "17052268", "doi": "10.1111/j.1574-695X.2006.00154.x", "url": "https://pubmed.ncbi.nlm.nih.gov/17052268/", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID17052268", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "carries_claims": [ "C14", "CSC2" ] }, { "n": 15, "citation": "Gieffers J, Reusche E, Solbach W et al. Failure to detect Chlamydia pneumoniae in brain sections of Alzheimer's disease patients. Journal of clinical microbiology. 2000.", "tier": "A", "kind": "primary", "pmid": "10655406", "doi": "10.1128/JCM.38.2.881-882.2000", "url": "https://pubmed.ncbi.nlm.nih.gov/10655406/", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID10655406", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "carries_claims": [ "C15", "CSC2" ] }, { "n": 16, "citation": "Ring RH, Lyons JM et al. Failure to detect Chlamydia pneumoniae in the late-onset Alzheimer's brain. Journal of clinical microbiology. 2000.", "tier": "A", "kind": "primary", "pmid": "10878049", "doi": "10.1128/JCM.38.7.2591-2594.2000", "url": "https://pubmed.ncbi.nlm.nih.gov/10878049/", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID10878049", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "carries_claims": [ "C16", "CSC2" ] }, { "n": 17, "citation": "Poole S, Singhrao SK, Kesavalu L et al. Determining the presence of periodontopathic virulence factors in short-term postmortem Alzheimer's disease brain tissue. Journal of Alzheimer's disease : JAD. 2013.", "tier": "A", "kind": "primary", "pmid": "23666172", "doi": "10.3233/JAD-121918", "url": "https://pubmed.ncbi.nlm.nih.gov/23666172/", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID23666172", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "carries_claims": [ "C17", "CSC2" ] }, { "n": 18, "citation": "Sparks Stein P, Steffen MJ, Smith C et al. Serum antibodies to periodontal pathogens are a risk factor for Alzheimer's disease. Alzheimer's & dementia : the journal of the Alzheimer's Association. 2012.", "tier": "A", "kind": "primary", "pmid": "22546352", "doi": "10.1016/j.jalz.2011.04.006", "url": "https://pubmed.ncbi.nlm.nih.gov/22546352/", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID22546352", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "carries_claims": [ "C18", "CSC3", "CSC4" ] }, { "n": 19, "citation": "Beydoun MA, Beydoun HA, Hossain S et al. Clinical and Bacterial Markers of Periodontitis and Their Association with Incident All-Cause and Alzheimer's Disease Dementia in a Large National Survey. Journal of Alzheimer's disease : JAD. 2020.", "tier": "A", "kind": "primary", "pmid": "32280099", "doi": "10.3233/JAD-200064", "url": "https://pubmed.ncbi.nlm.nih.gov/32280099/", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID32280099", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "carries_claims": [ "C19", "CSC3", "CSC4" ] }, { "n": 20, "citation": "Riviere GR, Riviere KH, Smith KS et al. Molecular and immunological evidence of oral Treponema in the human brain and their association with Alzheimer's disease. Oral microbiology and immunology. 2002.", "tier": "A", "kind": "primary", "pmid": "11929559", "doi": "10.1046/j.0902-0055.2001.00100.x", "url": "https://pubmed.ncbi.nlm.nih.gov/11929559/", "status_flags": [ "none_found" ], "opened": true, "opened_on": "2026-10-06", "status_checked_on": "2026-10-06", "study_id": "PMID11929559", "access_depth": "abstract_metadata", "access_note": "Complete primary abstract and linked-status metadata examined. No complete-paper or supplement audit claimed.", "carries_claims": [ "C20", "CSC2" ] }, { "n": 21, "citation": "Gutacker M, Valsangiacomo C, Balmelli T et al. Arguments against the involvement of Borrelia burgdorferi sensu lato in Alzheimer's disease. 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