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

Health Secretary Robert F. Kennedy Jr. announced last week that he had removed every member of an independent panel key to vaccine policy and access in America. After removing the 17 members of the panel, Kennedy announced eight new names, many of whom have been skeptical of vaccines.

The Advisory Committee on Immunization Practices helps the agency make recommendations on who should get certain vaccines.