Health and Human Services Secretary Robert F. Kennedy Jr. has had a busy few months. He fired the director of the Centers for Disease Control and Prevention, purged the agency’s vaccine advisory committee, and included among the group’s new members appointees who espouse anti-vaccine views.

The leadership upheavals, which he says will restore trust in federal health agencies, have shaken the confidence many states have in the CDC and led to the fracturing of a national, cohesive immunization policy that’s endured for three decades.

States and medical societies that long worked in concert with the CDC are breaking with federal recommendations, saying they no longer have faith in them amid the turmoil and Kennedy’s criticism of vaccines. Roughly seven months after Kennedy’s nomination was

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