{
  "researchDate": "2026-10-14",
  "revision": "vaccine-2026-10-15",
  "locale": "en",
  "presentation": "overview",
  "assessment": "Source-grounded explanation · research draft",
  "reviewNeeds": "Independent clinical/editorial approval remains pending; no personalized schedule.",
  "updateTriggers": "New studies, corrected sources, regulatory safety signals and changed local recommendations.",
  "geographicScope": {
    "kind": "global",
    "countryCodes": [],
    "jurisdictionCodes": [],
    "note": "Evidence and jurisdiction limits are stated beside the relevant claims."
  },
  "id": "childhood-vaccines-autism",
  "slug": "vaccines-autism",
  "topic": "Vaccines",
  "tag": "Vaccines & autism",
  "title": "Vaccines don't cause autism",
  "signLines": [
    "Vaccines don't",
    "cause autism"
  ],
  "question": "What do comparative studies find about vaccination and autism?",
  "summary": "Large studies across countries show that vaccines do not cause autism. The evidence covers MMR, thimerosal and aluminum. A diagnosis after vaccination does not establish a cause; reliable comparisons show whether autism is more common among vaccinated children.",
  "scope": "",
  "evidence": [
    {
      "id": "autism-studies",
      "heading": "Large studies have tested the claim",
      "text": "WHO’s 2025 assessment again found no causal link between vaccines and autism. The MMR review’s autism analysis included two observational studies totaling 1,194,764 children. Its result agrees with the broader evidence; it is not a randomized trial of every vaccine.",
      "sources": [
        1,
        2
      ],
      "detailTopics": [],
      "sourceIds": [
        "vaccine-update-a1",
        "vaccine-update-m1"
      ]
    },
    {
      "heading": "Children with an autistic sibling were studied too",
      "text": "A US study followed 95,727 children with older siblings. It found no increased autism risk linked to MMR, including among the 1,929 children with an autistic older sibling. The smaller sibling group leaves more uncertainty, and the study cannot answer every question about rare medical conditions.",
      "sources": [
        7
      ],
      "id": "autistic-siblings",
      "sourceIds": [
        "jain-mmr-2015"
      ]
    },
    {
      "id": "vaccine-ingredients",
      "heading": "Ingredient versions have also been studied",
      "text": "Thimerosal and aluminum are different substances. Evidence does not support either as a cause of autism. A Danish cohort studied cumulative vaccine aluminum and chronic outcomes in 1,224,176 children. It is observational, with a corrected supplement and limits for rare outcomes—not proof of zero risk from every vaccine.",
      "sources": [
        1,
        3
      ],
      "detailTopics": [
        "vaccine-ingredients"
      ],
      "aliases": [
        "aluminium"
      ],
      "sourceIds": [
        "vaccine-update-a1",
        "vaccine-update-a2"
      ]
    },
    {
      "id": "timing-and-cause",
      "heading": "A sequence of events does not establish a cause",
      "text": "Developmental changes may become noticeable around routine vaccination ages. Families’ observations deserve attention, but timing alone cannot explain the cause. Researchers compare groups and results across studies. Autistic people have different strengths and support needs; developmental concerns deserve assessment regardless of vaccination.",
      "sources": [
        1
      ],
      "detailTopics": [],
      "sourceIds": [
        "vaccine-update-a1"
      ]
    },
    {
      "id": "actual-formulation",
      "heading": "The actual formulation matters",
      "text": "The cited M-M-R II label lists no aluminum, thimerosal or formaldehyde. That statement concerns this formulation. It should not be generalized to every product worldwide or treated as the only reason the autism claim fails.",
      "sources": [
        4
      ],
      "detailTopics": [],
      "sourceIds": [
        "vaccine-update-i5"
      ]
    },
    {
      "id": "autism-safety",
      "heading": "Safety and side effects",
      "text": "Finding no autism link does not mean vaccines have no adverse effects. The MMR page explains its known side effects; the ingredients page covers ingredient-specific reactions and evidence.",
      "sources": [
        5,
        6
      ],
      "detailTopics": [
        "mmr"
      ],
      "quickLink": "Safety and side effects",
      "sourceIds": [
        "vaccine-update-m2",
        "vaccine-update-i2"
      ]
    }
  ],
  "takeaway": "Large studies across countries show that vaccines do not cause autism.",
  "limits": [
    "The findings apply to the vaccines, populations and outcomes studied. Personal recommendations depend on your health and current local guidance."
  ],
  "contextTitle": "",
  "contextIntro": "",
  "detail": "",
  "sources": [
    {
      "id": "vaccine-update-a1",
      "title": "Statement of the WHO Global Advisory Committee on Vaccine Safety (GACVS) on vaccines and autism",
      "publisher": "WHO, 2025",
      "url": "https://www.who.int/news/item/11-12-2025-statement-gacvs-vaccines-autism",
      "readerBlurb": "Assesses vaccine–autism evidence, including thimerosal and aluminum; this is not a finding of zero vaccine side effects.",
      "limit": "Assesses vaccine–autism evidence, including thimerosal and aluminum; this is not a finding of zero vaccine side effects.",
      "access": "Mapped to the 14 October 2026 research archive; selected fresh checks and access limits recorded in output/live-review/vaccine-content/independent-source-review.md.",
      "revision": "research-2026-10-15",
      "retrievedAt": "2026-10-14",
      "locale": "en",
      "type": "Evidence source",
      "geographicCoverage": {
        "kind": "undetermined",
        "countryCodes": [],
        "jurisdictionCodes": [],
        "note": "Assesses vaccine–autism evidence, including thimerosal and aluminum; this is not a finding of zero vaccine side effects."
      },
      "publicationTitle": "Statement of the WHO Global Advisory Committee on Vaccine Safety (GACVS) on vaccines and autism",
      "archiveDate": "2026-10-14",
      "supports": [
        "Large studies have tested the claim",
        "Ingredient versions have also been studied",
        "A sequence of events does not establish a cause"
      ],
      "limitationsInternal": [
        "Mapped to the 14 October 2026 research archive; selected fresh checks and access limits recorded in output/live-review/vaccine-content/independent-source-review.md.",
        "Assesses vaccine–autism evidence, including thimerosal and aluminum; this is not a finding of zero vaccine side effects."
      ],
      "limitationsPublic": [
        "Assesses vaccine–autism evidence, including thimerosal and aluminum; this is not a finding of zero vaccine side effects."
      ]
    },
    {
      "id": "vaccine-update-m1",
      "title": "Vaccines for measles, mumps, rubella, and varicella in children",
      "publisher": "Cochrane, 2021",
      "url": "https://www.cochrane.org/evidence/CD004407_does-measles-mumps-rubella-and-varicella-mmrv-vaccine-protect-children-and-does-it-cause-harmful",
      "readerBlurb": "Reviews effectiveness and harms in children. Different outcomes use different studies and participant totals.",
      "limit": "Reviews effectiveness and harms in children. Different outcomes use different studies and participant totals.",
      "access": "Mapped to the 14 October 2026 research archive; selected fresh checks and access limits recorded in output/live-review/vaccine-content/independent-source-review.md.",
      "revision": "research-2026-10-15",
      "retrievedAt": "2026-10-14",
      "locale": "en",
      "type": "Evidence source",
      "geographicCoverage": {
        "kind": "undetermined",
        "countryCodes": [],
        "jurisdictionCodes": [],
        "note": "Reviews effectiveness and harms in children. Different outcomes use different studies and participant totals."
      },
      "publicationTitle": "Vaccines for measles, mumps, rubella, and varicella in children",
      "archiveDate": "2026-10-14",
      "supports": [
        "Large studies have tested the claim"
      ],
      "limitationsInternal": [
        "Mapped to the 14 October 2026 research archive; selected fresh checks and access limits recorded in output/live-review/vaccine-content/independent-source-review.md.",
        "Reviews effectiveness and harms in children. Different outcomes use different studies and participant totals."
      ],
      "limitationsPublic": [
        "Reviews effectiveness and harms in children. Different outcomes use different studies and participant totals."
      ]
    },
    {
      "id": "vaccine-update-a2",
      "title": "Aluminum-Adsorbed Vaccines and Chronic Diseases in Childhood: A Nationwide Cohort Study",
      "publisher": "Annals of Internal Medicine, 2025",
      "url": "https://pubmed.ncbi.nlm.nih.gov/40658954/",
      "readerBlurb": "Danish observational cohort of 1,224,176 children. Its supplement was corrected; rare-outcome uncertainty remains.",
      "limit": "Danish observational cohort of 1,224,176 children. Its supplement was corrected; rare-outcome uncertainty remains.",
      "access": "Mapped to the 14 October 2026 research archive; selected fresh checks and access limits recorded in output/live-review/vaccine-content/independent-source-review.md.",
      "revision": "research-2026-10-15",
      "retrievedAt": "2026-10-14",
      "locale": "en",
      "type": "Evidence source",
      "geographicCoverage": {
        "kind": "undetermined",
        "countryCodes": [],
        "jurisdictionCodes": [],
        "note": "Danish observational cohort of 1,224,176 children. Its supplement was corrected; rare-outcome uncertainty remains."
      },
      "publicationTitle": "Aluminum-Adsorbed Vaccines and Chronic Diseases in Childhood: A Nationwide Cohort Study",
      "archiveDate": "2026-10-14",
      "supports": [
        "Ingredient versions have also been studied"
      ],
      "limitationsInternal": [
        "Mapped to the 14 October 2026 research archive; selected fresh checks and access limits recorded in output/live-review/vaccine-content/independent-source-review.md.",
        "Danish observational cohort of 1,224,176 children. Its supplement was corrected; rare-outcome uncertainty remains."
      ],
      "limitationsPublic": [
        "Danish observational cohort of 1,224,176 children. Its supplement was corrected; rare-outcome uncertainty remains."
      ]
    },
    {
      "id": "vaccine-update-i5",
      "title": "M-M-R II — Prescribing Information",
      "publisher": "FDA",
      "url": "https://www.fda.gov/downloads/BiologicsBloodVaccines/Vaccines/ApprovedProducts/UCM123789.pdf",
      "readerBlurb": "Ingredient and manufacturing information for this formulation, not every MMR product worldwide.",
      "limit": "Ingredient and manufacturing information for this formulation, not every MMR product worldwide.",
      "access": "Mapped to the 14 October 2026 research archive; selected fresh checks and access limits recorded in output/live-review/vaccine-content/independent-source-review.md.",
      "revision": "research-2026-10-15",
      "retrievedAt": "2026-10-14",
      "locale": "en",
      "type": "Evidence source",
      "geographicCoverage": {
        "kind": "undetermined",
        "countryCodes": [],
        "jurisdictionCodes": [],
        "note": "Ingredient and manufacturing information for this formulation, not every MMR product worldwide."
      },
      "publicationTitle": "M-M-R II — Prescribing Information",
      "archiveDate": "2026-10-14",
      "supports": [
        "The actual formulation matters"
      ],
      "limitationsInternal": [
        "Mapped to the 14 October 2026 research archive; selected fresh checks and access limits recorded in output/live-review/vaccine-content/independent-source-review.md.",
        "Ingredient and manufacturing information for this formulation, not every MMR product worldwide."
      ],
      "limitationsPublic": [
        "Ingredient and manufacturing information for this formulation, not every MMR product worldwide."
      ]
    },
    {
      "id": "vaccine-update-m2",
      "title": "Measles, Mumps, Rubella (MMR) Vaccine Safety",
      "publisher": "CDC",
      "url": "https://www.cdc.gov/vaccine-safety/vaccines/mmr.html",
      "readerBlurb": "Explains known MMR side effects; combined MMRV has a different seizure-risk comparison.",
      "limit": "Explains known MMR side effects; combined MMRV has a different seizure-risk comparison.",
      "access": "Mapped to the 14 October 2026 research archive; selected fresh checks and access limits recorded in output/live-review/vaccine-content/independent-source-review.md.",
      "revision": "research-2026-10-15",
      "retrievedAt": "2026-10-14",
      "locale": "en",
      "type": "Evidence source",
      "geographicCoverage": {
        "kind": "undetermined",
        "countryCodes": [],
        "jurisdictionCodes": [],
        "note": "Explains known MMR side effects; combined MMRV has a different seizure-risk comparison."
      },
      "publicationTitle": "Measles, Mumps, Rubella (MMR) Vaccine Safety",
      "archiveDate": "2026-10-14",
      "supports": [
        "Safety and side effects"
      ],
      "limitationsInternal": [
        "Mapped to the 14 October 2026 research archive; selected fresh checks and access limits recorded in output/live-review/vaccine-content/independent-source-review.md.",
        "Explains known MMR side effects; combined MMRV has a different seizure-risk comparison."
      ],
      "limitationsPublic": [
        "Explains known MMR side effects; combined MMRV has a different seizure-risk comparison."
      ]
    },
    {
      "id": "vaccine-update-i2",
      "title": "Aluminium adjuvants in vaccines and potential health effects: systematic review",
      "publisher": "BMJ, 2026",
      "url": "https://www.bmj.com/content/393/bmj-2025-088921",
      "readerBlurb": "59 studies with uneven evidence quality. Recognizes uncommon persistent local reactions and gaps for rare or delayed outcomes.",
      "limit": "59 studies with uneven evidence quality. Recognizes uncommon persistent local reactions and gaps for rare or delayed outcomes.",
      "access": "Mapped to the 14 October 2026 research archive; selected fresh checks and access limits recorded in output/live-review/vaccine-content/independent-source-review.md.",
      "revision": "research-2026-10-15",
      "retrievedAt": "2026-10-14",
      "locale": "en",
      "type": "Evidence source",
      "geographicCoverage": {
        "kind": "undetermined",
        "countryCodes": [],
        "jurisdictionCodes": [],
        "note": "59 studies with uneven evidence quality. Recognizes uncommon persistent local reactions and gaps for rare or delayed outcomes."
      },
      "publicationTitle": "Aluminium adjuvants in vaccines and potential health effects: systematic review",
      "archiveDate": "2026-10-14",
      "supports": [
        "Safety and side effects"
      ],
      "limitationsInternal": [
        "Mapped to the 14 October 2026 research archive; selected fresh checks and access limits recorded in output/live-review/vaccine-content/independent-source-review.md.",
        "59 studies with uneven evidence quality. Recognizes uncommon persistent local reactions and gaps for rare or delayed outcomes."
      ],
      "limitationsPublic": [
        "59 studies with uneven evidence quality. Recognizes uncommon persistent local reactions and gaps for rare or delayed outcomes."
      ]
    },
    {
      "id": "jain-mmr-2015",
      "revision": "research-2026-10-07",
      "title": "Autism Occurrence by MMR Vaccine Status Among US Children With Older Siblings",
      "publisher": "JAMA, 2015; corrected 2016",
      "url": "https://jamanetwork.com/journals/jama/fullarticle/2275444/",
      "type": "US claims cohort",
      "access": "Corrected full article, Table 2 and limitations inspected in supplied dossier",
      "limit": "Privately insured children with siblings; claims ascertainment, vaccine avoidance and subgroup precision limit generalization.",
      "retrievedAt": "2026-10-07",
      "locale": "en",
      "geographicCoverage": {
        "kind": "undetermined",
        "countryCodes": [],
        "jurisdictionCodes": [],
        "note": "Privately insured children with siblings; claims ascertainment, vaccine avoidance and subgroup precision limit generalization."
      },
      "readerTitle": "MMR and autism in children with older siblings",
      "readerAccess": "We could read the full corrected article, including its results and correction.",
      "readerLimit": "The study used US insurance records. Some parents may have delayed vaccination after developmental concerns. Smaller groups, including children with an autistic sibling, leave more uncertainty.",
      "supports": [
        "Children with an autistic sibling were studied too"
      ],
      "limitationsInternal": [
        "Corrected full article, Table 2 and limitations inspected in supplied dossier",
        "Privately insured children with siblings; claims ascertainment, vaccine avoidance and subgroup precision limit generalization."
      ],
      "limitationsPublic": [
        "The study used US insurance records. Some parents may have delayed vaccination after developmental concerns. Smaller groups, including children with an autistic sibling, leave more uncertainty."
      ]
    }
  ],
  "dossier": "vaccine_autism_evidence_review.md",
  "related": [
    {
      "slug": "mmr",
      "label": "Measles vaccines",
      "reason": "Protection and known MMR side effects."
    },
    {
      "slug": "vaccine-ingredients",
      "label": "Vaccine ingredients",
      "reason": "Chemistry, amounts and ingredient-specific studies."
    },
    {
      "slug": "vaccine-schedule",
      "label": "Childhood schedules",
      "reason": "What schedule safety studies test."
    }
  ],
  "shareContext": "Childhood-vaccine studies, especially MMR, do not support an autism link. Other side effects still matter.",
  "socialContext": "Studies of childhood vaccines, especially MMR, do not support an autism link. Other side effects still matter.",
  "copyReviewedAt": "2026-10-15",
  "readerCopyEdition": "vaccine-clarity-2026-10-15",
  "citationDesignEdition": "publication-first-1",
  "assetDesignEdition": "space-first-1",
  "keyPoints": [
    {
      "text": "The latest WHO review again found no causal link.",
      "sources": [
        1
      ]
    },
    {
      "text": "MMR studies including more than a million children found no increased autism risk.",
      "sources": [
        2
      ]
    },
    {
      "text": "Studies of thimerosal and aluminum also find no causal link.",
      "sources": [
        1,
        3
      ]
    }
  ],
  "questions": [],
  "questionsHeading": "Find the answer you need",
  "supplementalDossiers": [],
  "headline": {
    "text": "Vaccines don't cause autism",
    "revision": 1,
    "status": "draft",
    "sourceMessageId": null,
    "approvedAt": null,
    "authority": "Existing owner decisions recorded in AGENTS/D39; unavailable message IDs are not invented."
  },
  "language": "en",
  "jurisdiction": {
    "kind": "global",
    "countryCodes": [],
    "jurisdictionCodes": [],
    "note": "Evidence and jurisdiction limits are stated beside the relevant claims."
  },
  "claimScope": "",
  "research": {
    "dossierRef": "docs/research/vaccine_autism_evidence_review.md",
    "reviewedAt": "2026-10-14",
    "reviewDue": "New studies, corrected sources, regulatory safety signals and changed local recommendations.",
    "contraryEvidenceConsidered": [],
    "status": "research draft; editorial/context review separate"
  },
  "status": "researched draft preview",
  "realWorldClaimReviewed": false,
  "clinicalEditorialApproved": false
}