WASHINGTON — The former head of the Atlanta-based Centers for Disease Control and Prevention said she worries the Trump administration is rejecting science and expertise in public health to potentially devastating effects.

Susan Monarez, who was fired after less than a month on the job, testified before the Senate’s health committee Wednesday about the details surrounding her ouster and the unraveling of her relationship with Health and Human Services Secretary Robert F. Kennedy Jr. She provided a contrast to the version provided by Kennedy during testimony before a different committee two weeks ago.

Monarez said Kennedy had asked her to commit to firing CDC experts and wanted her to preapprove new vaccine guidelines without any review or input. She said she refused on the grounds that i

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