Erna Nemdy (“earn an M.D.”), a 25-year-old junior medical student brings her healthy 4-month-old daughter, Beverly, to the pediatrician for her second diphtheria, pertussis, tetanus (DTaP,acellular pertussis) immunization, which she received along with the pneumococcal, inactivated polio, haemophilus influenza and rotavirus vaccines.