HHS revised CDC autism-and-vaccines webpage to introduce vaccine-autism uncertainty, replacing evidence-based guidance, to secure a Senate vote

On July 22, 2026, the U.S. Department of Health and Human Services revised the CDC's autism-and-vaccines webpage, removing explicit language that asserted a link between vaccines and autism is not evidence-based and replacing it with language stating that "Scientists have not identified the root causes of autism" and that HHS would update the page "as reliable new evidence becomes available." The change was made at the direction of HHS Secretary Robert F. Kennedy Jr.

The July 2026 revision came after a prior change in November 2025, when the CDC had added the sentence "Vaccines do not cause autism is not an evidence-based claim" to the same page, directly contradicting the scientific consensus and the CDC's longstanding guidance. The July 2026 change modified both the November addition and surrounding language, producing a version that omits the prior denial of the vaccine-autism link without providing a scientifically accurate replacement.

Decades of large-scale epidemiological research have established no causal link between vaccines and autism. The scientific consensus on this question is not contested in peer-reviewed literature. The CDC's pre-2025 guidance stated that vaccines do not cause autism.

The motivation for the July 22 revision was disclosed publicly. Sen. Bill Cassidy, chairman of the Senate Health, Education, Labor and Pensions (HELP) Committee, cited the change as the "sign of good faith" that secured his vote to advance CDC director nominee Dr. Erica Schwartz through committee. Cassidy had previously voted to confirm Kennedy on the assurance that "CDC will not remove statements on their website pointing out that vaccines do not cause autism." After the November 2025 change, HHS met Cassidy's renewed demand for the July 2026 revision. Cassidy said after reviewing the updated text that he was confident Schwartz "knows what she is doing and will stand against those who don't."

The revision used the official federal public health website to introduce language implying scientific uncertainty about a settled question, executed for a political purpose — securing a Senate confirmation vote — rather than to correct a factual error or incorporate new scientific evidence.