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Claim 06 · Children

Vaccines: "they cause autism".

A vaccine vial beside a field of dots standing for over 1.2 million children studied A small vial with a dropper above it, beside a dense grid of three hundred tiny dots. The dots stand for the over 1.2 million children studied, in whom no link between vaccines and autism was found.

As forwarded

"Vaccines cause autism."

Circulates in Indian parent groups as text and video, often citing the 1998 Lancet paper or US political statements. WHO's expert group reaffirmed the absence of any link in 2025 in response to renewed US claims [S1]. Specific reach figure: not available. Reach not available

Verdict

Unsupported

Studies covering more than 1.2 million children, including a 657,000-child national cohort, find no link between vaccines (MMR or any other) and autism; the single 1998 paper that started the scare studied 12 children and was retracted for false statements.

Unsupported

Why this is the strongest possible negative finding:The claim has been tested in over a million children and is false.

What the evidence says

Established

Meta-analysis. Taylor, Swerdfeger and Eslick pooled 5 cohort studies (1,256,407 children) and 5 case-control studies (9,920 children). Pooled odds ratios: vaccination and autism 0.99 (95% CI 0.92–1.06); vaccination and ASD 0.91 (0.68–1.20); MMR and autism 0.84 (0.70–1.01); thimerosal 1.00 (0.77–1.31); mercury 1.00 (0.93–1.07). Conclusion: vaccinations, vaccine components and multiple vaccines are not associated with autism or ASD. [S2]

Established

Largest single cohort. Hviid et al. followed 657,461 Danish children born 1999–2010 for 5,025,754 person-years; 6,517 developed autism. The adjusted hazard ratio for MMR-vaccinated versus unvaccinated children was 0.93 (95% CI 0.85–1.02). No increased risk in children with autistic siblings (aHR 1.15, 0.71–1.87), in high-risk-score children, or in any period after vaccination. The authors conclude MMR does not increase autism risk, does not trigger autism in susceptible children, and is not associated with clustering of cases after vaccination. [S3]

Established

The origin of the claim. Wakefield et al., Lancet 1998, was a case series of 12 children. The Lancet fully retracted it on 2 February 2010 after the UK General Medical Council found that the claims that children were "consecutively referred" and that investigations were "approved" by the ethics committee were false. [S4][S5]

Established

Guideline position. WHO's Global Advisory Committee on Vaccine Safety concluded that "no evidence exists of a causal association between MMR vaccine and autism or autistic disorders" after reviewing eleven epidemiological studies and three laboratory studies. [S6] WHO reaffirmed this in 2025. [S1]

What to do instead

  1. Follow India's Universal Immunisation Programme schedule through your paediatrician or the nearest government health centre. (Indian Academy of Pediatrics schedule page: not opened; link to be added by the reviewer.)

  2. Report any suspected adverse event after immunisation to the vaccinator or the state AEFI system rather than to a WhatsApp group.

  3. Concerns about a child's development (speech, eye contact, social response): ask the paediatrician for a developmental screen; early intervention helps regardless of cause.

Share card

Sources

  1. S1
    Medical Dialogues. WHO reaffirms vaccines do not cause autism, ending a 25-year-old myth.Circulation only; not evidence · 2025; WHO's own 2025 statement not opened
    health.medicaldialogues.in/vaccines/who-reaffirms-vaccines-do-not-cause-autism-ending-a-25-year-old-myth-160474
  2. S2
    Taylor LE, Swerdfeger AL, Eslick GD. Vaccines are not associated with autism: an evidence-based meta-analysis of case-control and cohort studies. Vaccine 2014;32(29).Tier 1 · 2014; abstract opened at TechNet-21
    technet-21.org/en/resources/journal-article/vaccines-are-not-associated-with-autism-an-evidence-based-meta-analysis-of-case-control-and-cohort-studies
  3. S3
    Hviid A et al. Measles, mumps, rubella vaccination and autism: a nationwide cohort study. Annals of Internal Medicine 2019;170:513–520 (n=657,461).Tier 3 · 2019; full text opened at a mirror PDF
    house.mn.gov/comm/docs/XT0R_XfsTkOnK-rQZRIrkw.pdf
  4. S4
    The Lancet. Retraction of Wakefield et al. 1998;351:637–41 (notice, 2 February 2010).Tier not graded in the research file · 2010; retraction notice
    briandeer.com/solved/lancet-retraction-2010.pdf
  5. S5
    Greenhalgh T. Why did the Lancet take so long? BMJ 2010;340:c644.Tier 3 commentary · 2010
    bmj.com/content/340/bmj.c644.full
  6. S6
    WHO Global Advisory Committee on Vaccine Safety. MMR vaccines and autism.Tier 2 · December 2002, published January 2003
    who.int/groups/global-advisory-committee-on-vaccine-safety/topics/mmr-vaccines-and-autism

Tiers are as graded in the research file. "Circulation only" sources document that a claim circulates and are never cited as evidence. Where a primary paper could not be opened, the page says so in the Honest note.

Reviewed by

Medical review: being arranged

Every evidence sentence on this page traces to the sources listed above, but no registered physician has yet signed it off. When one has, their name, registration number and date of review will appear here. Until then, read this page as a sourced guide, not as medical advice: for any symptom, call 108 or 112, or see a doctor.

Corrections

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