Association of the use of MMRV in infants by pediatric infectious disease specialists with that of other affiliated providers

These data suggest that while most providers followed the ACIP recommendation to administer MMR and V separately, Pediatric Infectious Disease specialists' vaccination practices may impact compliance with ACIP recommendations by other providers. Further study of the drivers behind the use of MMRV rather than MMR + V as the first dose of measles-containing vaccine is needed to determine if reinforcement or if clarification of ACIP recommendations is needed to elucidate when MMRV might be preferred over MMR + V.