The rewriting of a page on the CDC’s website to assert the false claim that vaccines may cause autism sparked a torrent of anger and anguish from doctors, scientists, and parents who say Health and Human Services Secretary Robert F. Kennedy Jr. is wrecking the credibility of an agency they’ve long relied on for unbiased scientific evidence.

Many scientists and public health officials fear that the Centers for Disease Control and Prevention’s website, which now baselessly claims that health authorities previously ignored evidence of a vaccine-autism link, foreshadows a larger, dangerous attack on childhood vaccination.

“This isn’t over,” said Helen Tager-Flusberg, a professor emerita of psychology and brain science at Boston University. She noted that Kennedy hired several longtime anti-v

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