Health Secretary Robert F. Kennedy Jr ., once a leading anti-vaccine activist, has removed every member of a scientific committee that advises the Centers for Disease Control and Prevention on how to use vaccines and pledged to replace them with his own picks.

The 17-member Advisory Committee on Immunization Practices had been in a state of flux since Kennedy took over. Its first meeting this year had been delayed when the U.S. Department of Health and Human Services abruptly postponed its February meeting.

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