DoubleChecks

What was claimed

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

Our verdict

Accurate

A 2025 U.S. cohort study of more than 2.5 million children found no increased autism risk with first MMR vaccination before age 2. The study reported a near-null adjusted hazard ratio and concluded there was no association.

All 3 AI systems agree20 sources citedChecked Aug 10, 2026

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Key findings

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

Verified95%
All 4 AIs agree

The study is large and from the US

Verified95%
1 AI checked

The study suggests (rather than definitively proves) no link

Verified95%
1 AI checked

Verified against 20 sources

cidrap.umn.edupubmed.ncbi.nlm.nih.govpmc.ncbi.nlm.nih.govchop.educdc.govautismspeaks.orgncbi.nlm.nih.govautismsciencefoundation.orgacpjournals.orgpubmed.ncbi.nlm.nih.govnejm.orgpmc.ncbi.nlm.nih.govreddit.compubmed.ncbi.nlm.nih.govpubmed.ncbi.nlm.nih.govpmc.ncbi.nlm.nih.govhouse.mn.govpmc.ncbi.nlm.nih.govthelancet.compmc.ncbi.nlm.nih.gov

Detailed Analysis

The claim is supported by a large recent U.S. cohort study showing no association between first MMR vaccination before age 2 and autism. The study’s main estimate was near null, and multiple prior reviews and epidemiologic studies also found no link.

Why this verdict

  • The claim is supported by a large recent U.S.
  • cohort study showing no association between first MMR vaccination before age 2 and autism.
  • The study’s main estimate was near null, and multiple prior reviews and epidemiologic studies also found no link.

Claims checked

A large US study suggests this finding

Verified97%
The cited study is a large national retrospective cohort study in the United States with over 2.5 million children. Its conclusions directly support the wording that the study suggests no link.

No link between MMR vaccination before age 2 and autism

Verified98%
A 2025 U.S. cohort study of more than 2.5 million children found no increased autism risk with first MMR vaccination before age 2. The study reported a near-null adjusted hazard ratio and concluded there was no association.

What other AI think

The headline accurately reflects the findings of a recent large US study. The study examined over 2.5 million children and found no association between MMR vaccination timing before age 2 and autism diagnosis, which aligns with decades of scientific evidence confirming no link between MMR and autism.

Why this verdict

  • The headline accurately reflects the findings of a recent large US study.
  • The study examined over 2.5 million children and found no association between MMR vaccination timing before age 2 and autism diagnosis, which aligns with decades of scientific evidence confirming no link between MMR and autism.

Claims checked

There is no link between MMR vaccination before age 2 and autism

Verified95%
A recent large US study (published July 2026) of 2.5+ million children found no association between MMR vaccination timing before age 2 and autism diagnosis. This finding is consistent with extensive prior research and systematic reviews confirming no MMR-autism link.

The study is large and from the US

Verified95%
The study examined records of 2.5+ million American children using the Cosmos electronic health record database, covering January 2015 through December 2024, and was published in the Pediatric Infectious Disease Journal.

The study suggests (rather than definitively proves) no link

Verified95%
The word 'suggests' is appropriately cautious language for a single study, even a large one. The study's primary analysis showed an adjusted hazard ratio of 0.97 with a 99% confidence interval of 0.91-1.03, indicating no increased risk.
Multiple large, well-designed US and international studies have found no association between MMR vaccination in early childhood and later autism spectrum disorder. The headline accurately summarizes the consensus of large cohort analyses showing no increased autism risk after MMR given before age 2.

Why this verdict

  • Multiple large, well-designed US and international studies have found no association between MMR vaccination in early childhood and later autism spectrum disorder.
  • The headline accurately summarizes the consensus of large cohort analyses showing no increased autism risk after MMR given before age 2.

Claims checked

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

Verified90%
Large cohort studies in the US (including analyses of roughly 95,000 children) and other countries have reported no increased risk of autism following MMR vaccination given in early childhood.

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