DoubleChecks

What was claimed

No link between MMR vaccination before age 2 and autism, large US study suggests

Our verdict

Accurate

A large U.S. retrospective cohort study of more than 2.5 million children found that receiving the first MMR dose between 11.5 and 24 months was not associated with increased autism risk (adjusted hazard ratio 0.97; 99% CI 0.91–1.03), concluding no association between MMR vaccination before 24 months and childhood autism.

All 3 AI systems agree17 sources citedChecked Aug 5, 2026

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Key findings

No link between MMR vaccination before age 2 and autism, large US study suggests

Verified94%
All 3 AIs agree

This is from a large US study

Verified95%
1 AI checked

The study suggests this finding (implying it is recent research)

Verified95%
1 AI checked

Verified against 17 sources

cidrap.umn.edupubmed.ncbi.nlm.nih.govpmc.ncbi.nlm.nih.govchop.educdc.govnejm.orgncbi.nlm.nih.govacpjournals.orgpubmed.ncbi.nlm.nih.govpmc.ncbi.nlm.nih.govhouse.mn.govautismspeaks.orgpubmed.ncbi.nlm.nih.govpubmed.ncbi.nlm.nih.govpubmed.ncbi.nlm.nih.govpmc.ncbi.nlm.nih.govpmc.ncbi.nlm.nih.gov

Detailed Analysis

The response repeats the headline of a recent large U.S. cohort study that found no association between receiving the MMR vaccine before age 2 and autism. This finding is directly supported by the cited study and is consistent with a large body of prior research showing no link between MMR vaccination and autism. The wording is neutral and not overstated.

Why this verdict

  • The response repeats the headline of a recent large U.S.
  • cohort study that found no association between receiving the MMR vaccine before age 2 and autism.
  • This finding is directly supported by the cited study and is consistent with a large body of prior research showing no link between MMR vaccination and autism.
  • The wording is neutral and not overstated.

Claims checked

No link between MMR vaccination before age 2 and autism, large US study suggests

Verified95%
A large U.S. retrospective cohort study of more than 2.5 million children found that receiving the first MMR dose between 11.5 and 24 months was not associated with increased autism risk (adjusted hazard ratio 0.97; 99% CI 0.91–1.03), concluding no association between MMR vaccination before 24 months and childhood autism.[1] [2] This aligns with extensive prior epidemiologic research and reviews finding no causal link between MMR vaccination and autism.[3] [7] [9] [13] [16]

What other AI think

The claim accurately reflects a recent large US study published in 2026 that examined over 2.5 million children and found no association between MMR vaccination before age 2 and autism diagnosis. This finding is consistent with decades of scientific evidence and multiple systematic reviews confirming vaccine safety.

Why this verdict

  • The claim accurately reflects a recent large US study published in 2026 that examined over 2.5 million children and found no association between MMR vaccination before age 2 and autism diagnosis.
  • This finding is consistent with decades of scientific evidence and multiple systematic reviews confirming vaccine safety.

Claims checked

No link between MMR vaccination before age 2 and autism

Verified95%
A large 2026 US study of 2.5 million children found no association between receiving the first MMR vaccine before age 2 and autism diagnosis. This aligns with extensive prior research and systematic reviews.

This is from a large US study

Verified95%
The study involved 2,560,035 US children from the Cosmos electronic health record database, with follow-up through age 8 years, making it a large, population-based cohort study.

The study suggests this finding (implying it is recent research)

Verified95%
The study was published in 2026 in Pediatric Infectious Disease Journal and represents recent research using data from January 2015 through December 2024.
Multiple large, well-documented cohort studies have found no association between MMR given before age 2 and later autism. A recent U.S. electronic health record cohort of about 2.56 million children likewise reported no increased risk, supporting the headline's conclusion.

Why this verdict

  • Multiple large, well-documented cohort studies have found no association between MMR given before age 2 and later autism.
  • A recent U.S.
  • electronic health record cohort of about 2.56 million children likewise reported no increased risk, supporting the headline's conclusion.

Claims checked

No link between MMR vaccination before age 2 and autism, large US study suggests

Verified92%
A recent large U.S. EHR cohort study of ~2,560,035 children reported no increased autism risk after first MMR given at 11.5–24 months (adjusted hazard ratio ~0.97, CI including 1), consistent with many prior large studies and reviews finding no causal link.

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