The webpage that gets passed around family group chats, the CDC's official page on autism and vaccines, changed again last week. A note explaining why the page still carries the header "Vaccines do not cause autism" is gone. In its place, the agency now says: "Scientists have not identified the root causes of autism. HHS continues to support rigorous scientific research and will update this page as reliable new evidence becomes available."

The change arrived in the middle of a Senate confirmation fight. CNN reported on July 23 that the new language appeared as Sen. Bill Cassidy of Louisiana, who chairs the Senate health committee, prepared his colleagues to vote on Dr. Erica Schwartz, the administration's nominee to lead the CDC. Cassidy described the update as a sign of good faith from the administration and said he expects Schwartz to have the votes she needs. The committee vote, originally scheduled for July 23, was pushed to this week.

The Second Rewrite in a Year

For years, the CDC page stated without qualification that vaccines do not cause autism. In November 2025, the agency rewrote it. The rewritten page kept that header, under an agreement Cassidy had negotiated, but added language calling "vaccines do not cause autism" a claim that is not evidence-based, and suggested health authorities had ignored possible links.

The medical community pushed back hard at the time. Dr. Sean O'Leary, who leads the American Academy of Pediatrics committee on infectious diseases, called the change "madness" and said vaccines "do not cause autism. Period." The Autism Science Foundation said it was appalled by the shift in messaging.

Last week's edit went a step further by removing the note that had credited the Cassidy agreement for the surviving header. Boston University autism researcher Helen Tager-Flusberg told Disability Scoop the revised page "misrepresents the evidence and all but claims that vaccines cause autism."

What the Evidence Says

The research record did not change last week; only the webpage did.

The question of whether vaccines cause autism has been studied across millions of children in multiple countries, and the answer has been consistent. A 2019 Danish study published in the Annals of Internal Medicine followed 657,461 children and found no increased autism risk after the MMR vaccine, including among children with autistic siblings, the group at highest genetic likelihood. Earlier this year, a large study found no link between mRNA COVID vaccination during pregnancy and autism in children.

The claim on the other side traces back to a 1998 paper involving 12 children. The journal that published it retracted it, and its lead author lost his medical license after investigators found the data had been manipulated.

The American Academy of Pediatrics, the American Medical Association, and every major medical organization that has reviewed the evidence hold the same position they held a year ago: vaccines do not cause autism.

What This Changes for Your Family

The webpage edit does not change the childhood immunization schedule, and it does not change the school and daycare vaccination requirements your state sets.

The practical effect lands somewhere more personal. If you parent an autistic child, you have probably fielded the question from a relative or a stranger at least once: do you think it was the vaccines? The CDC's new wording will hand that question fresh energy, because the page people cite as the authority no longer answers it the way it used to. The numbers above, 657,461 children in one study alone, are worth having on hand for that conversation.

If the shifting language leaves you unsure about anything on your own child's schedule, your pediatrician is still the right first call. The AAP's parent-facing site, HealthyChildren.org, continues to publish its vaccine guidance unchanged.

Where Your Voice Fits

This is the latest in a series of federal moves reshaping how autism is studied and discussed. HHS is seeking access to medical records for its autism research effort, and the federal autism committee lost most of its independent scientists earlier this year.

Two places accept your input right now. Public comment on the federal autism strategic plan is open through August 20, and comments from parents describing what research priorities matter to their families become part of the official record. The Senate health committee vote on Dr. Schwartz is expected this week, and the offices of committee members log constituent calls before confirmation votes. The evidence base belongs to the public that funded it, and the people it describes are your kids.