The Centers for Disease Control and Prevention has made a dramatic about-face in the agency's position on the relationship between vaccines and autism.

The CDC's website now says a link between vaccines and autism cannot be ruled out. That's a reversal from the CDC's longstanding stance that there is no link.

The change comes even though a connection between vaccines and autism has long been debunked by a large body of high-quality research. But Health Secretary Robert F. Kennedy Jr. has long promoted the discredited claim.

The CDC's change is alarming public health experts. They are already worried about a drop in childhood vaccination, which has led to a resurgence of dangerous childhood diseases like measles and whooping cough.

"The Centers for Disease Control and Prevention website

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