Antibody Persistence and Booster Vaccination During the Second and Fifth Years of Life in a Cohort of Children Who Were Born Prematurely

Background:These studies assessed the immunogenicity and reactogenicity of booster vaccination with diphtheria-tetanus-acellular pertussis-hepatitis B-inactivated poliovirus-adsorbed conjugated Haemophilus influenzae type b (DTaP-HBV-IPV/Hib) at 18–20 months, and with DTaP during the fifth year of l