Before Nov. 19, 2025, the CDC’s website was unequivocal on the topic : “Studies have shown that there is no link between receiving vaccines and developing autism spectrum disorder,” it read. After Nov. 19 , the guidance essentially reversed. “The claim ‘vaccines do not cause autism’ is not an evidence-based claim because studies have not ruled out the possibility that infant vaccines cause autism,” it now says. “Studies supporting a link have been ignored by health authorities.”

That claim, reflecting the longstanding vaccine-skeptical views of Robert F. Kennedy Jr., Secretary of Health and Human Services (HHS), is false.…