New York — Health Secretary Robert F. Kennedy Jr. personally directed the U.S. Centers for Disease Control and Prevention to update its website to contradict its longtime guidance that vaccines don't cause autism, he told The New York Times in an interview published Friday.

His comments provide clarity into who directed the CDC's website change, after many current and former staffers at the agency were surprised to see new published guidance on Wednesday that defies scientific consensus. Kennedy, a longtime vaccine critic, has upended the public health agencies he oversees and pushed for and enacted changes that have unsettled much of the medical community, which sees his policies as harmful for Americans.

“The whole thing about ‘vaccines have been tested and there’s been this determi

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