The 17 members of the CDC's vaccine advisory committee, who were ousted last week, argued their abrupt dismissal has "left the U.S. vaccine program critically weakened."

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.

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.