A U.S. government scientist who oversees the team responsible for collecting data on COVID-19 and RSV hospitalizations used to shape national vaccine policy has resigned, citing concerns over how such data would be used by the Trump administration.

A Centers for Disease Control and Prevention official who led the agency's network to study hospitalization trends from infectious diseases like COVID-19 has resigned in protest following Health and Human Services Secretary Robert F. Kennedy Jr.'s orders to change the agency's vaccine recommendations and the committee that makes them.

Fiona Havers, who oversaw CDC respiratory virus data, told colleagues she no longer had confidence the data would be used objectively to set vaccine policy.