At the first meeting of a controversial new group of vaccine advisers to the US Centers for Disease Control and Prevention, the committee announced new plans to study established vaccine guidelines.

The US Centers for Disease Control and Prevention’s vaccine panel is adding new subcommittees to review the current childhood immunization schedule and examine shots that haven’t been studied in at least seven years,

Dr. Michael Ross withdrew from the federal vaccine safety advisory committee Wednesday, two weeks after Health and Human Services Secretary Robert F. Kennedy Jr. appointed him. The Centers for Disease Control and Prevention’s Advisory Committee for Immunization Practices had yet to have its first meeting among the original eight members Kennedy appointed.