A Centers for Disease Control and Prevention (CDC) webpage received attention after a major update on November 20, 2025. The change appeared in the “vaccine safety” section. It said the claim “Vaccines do not cause autism” is not an evidence-based statement. This surprised many people because scientists have agreed for years that vaccines do not cause autism. The Autism Science Foundation said the new wording was misleading and ignored many studies showing no link. The American Academy of Pediatrics also disagreed with the update and said the science was already clear. Former CDC officials said many scientific staff did not know about the change, which raised concerns about how it was approved. The CDC website is supervised by the Department of Health and Human Services (HHS), led by Secretary Robert F. Kennedy Jr., who has questioned vaccine safety in the past.

The updated page did not include any new research. Instead, it said older studies suggesting a link had already been dismissed by health experts. An HHS spokesperson said the agency had started a broad review of autism research. Former CDC leaders warned that the change might show political influence. The headline “Vaccines do not cause autism” remains on the page, but an asterisk says it stays because of an agreement with a Senate committee. Experts said the situation could affect public trust and future communication.