The Centers for Disease Control and Prevention revised vaccine safety language on its website to state the claim that vaccines do not cause autism is “not an evidence‑based claim” and that studies have not ruled out the possibility of a link. The change, communicated on the CDC site and tied to a broader HHS review, echoed longstanding assertions promoted by Health and Human Services Secretary Robert F. Kennedy Jr. Medical societies and public‑health experts reacted sharply: the American Academy of Pediatrics and multiple epidemiologists reiterated that large, high‑quality studies involving millions of subjects have found no causal relationship between vaccines and autism. Critics warned the revised phrasing could undermine vaccine confidence and depress uptake for routine childhood immunizations. HHS defended a comprehensive assessment of autism’s causes; public‑health stakeholders called for clarifying language and evidence‑based messaging to avoid eroding trust in established immunization programs.