“We’re still not back to where we need to be,” said Dr. Sean O’Leary, a pediatric infectious disease doctor at Children’s Hospital Colorado and a professor of pediatrics at the University of Colorado School of Medicine. Routine immunizations protect children against 16 infectious diseases, including measles, diphtheria and chickenpox, and inhibit transmission to the community. The rollout of Covid shots for younger kids is an opportunity to catch up on routine vaccinations, O’Leary said, adding that children can get the vaccines together.