WASHINGTON — America’s public health system is headed to a “very dangerous place” with Health Secretary Robert F. Kennedy Jr. and his team of anti-vaccine advisers in charge, the fired Centers for Disease Control and Prevention chief warned senators on Wednesday.

Describing extraordinary turmoil inside the nation’s health agencies, Susan Monarez and another former top CDC official described exchanges in which Kennedy or political advisers rebuffed data supporting the safety and efficacy of vaccines.

Monarez, who was fired this month after just 29 days on the job following disagreements with Kennedy, told members of the Senate’s health committee that deadly diseases like polio and whooping cough, long contained, are poised to make a comeback in the U.S.

“I believe preventable diseases wi

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