Health Secretary Robert F. Kennedy Jr. has removed every member of a scientific committee that advises the Centers for Disease Control and Prevention on how to use vaccines.

Canadian doctors and scientists say Robert F. Kennedy Jr.'s firing of an immunization advisory committee south of the border is worrisome. On Monday, the U.S.

U.S. Health and Human Services Secretary Robert F. Kennedy Jr. on Wednesday announced new members to the U.S. Centers for Disease Control and Prevention panel of vaccine experts, days after he said he fired all 17 of its members.