The Brief The Advisory Committee on Immunization Practices is set to meet Thursday and Friday to recommend how already-approved vaccines should be used. The panel advised that the vaccine known as MMRV not be given before age 4 and that children in this age group instead get separate vaccines — one against MMR and another for varicella, or chickenpox. FILE - Vaccines including varicella, hepatitus A, prevnar and measles, mumps and rubella at Lurie Children's Primary Care Town & Country Pediatrics on Oct. 18, 2022, in Chicago. The American Academy of Pediatrics and most public health officials support hepatitis B shots for babies. Roberts was supposed to be on the vaccine panel, but Kennedy dismissed her earlier this year.