Immunogenicity and Reactogenicity of a Three-Dose Primary Vaccination Course With a Combined Diphtheria-Tetanus-Acellular Pertussis-Hepatitis B-Inactivated Polio-Haemophilus influenzae Type b Vaccine Coadministered With a Meningococcal C Conjugate Vaccine

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Aim:To evaluate the immunogenicity and safety of 3 doses of the combined diphtheria-tetanus toxoids-acellular pertussis-hepatitis B virus-inactivated poliovirus/Haemophilus influenzae type b (DTPa-HBV-IPV/Hib) vaccine (Infanrix hexa) when coadministered with a CRM197-conjugated meningococcal C vaccine (Meningitec) at different injection sites during the same visit or during separate visits.Methods:Healthy infants were randomized in an open randomized multicenter study to receive either the DTPa-HBV-IPV/Hib and meningococcal C conjugate vaccines during the same vaccination visit at 2, 4 and 6 months of age (coadministration group) or the DTPa-HBV-IPV/Hib vaccine at 2, 4 and 6 months of age and the meningococcal C conjugate vaccine at 3, 5 and 7 months of age (separate administration group).Results:The immunogenicity analysis included 452 infants, 228 in the coadministration group and 224 in the separate administration group. One month after primary vaccination, 99.1% of subjects in both groups achieved anti-polyribosylribitol phosphate antibody concentrations ≥0.15 μg/mL. The vaccine response against pertussis antigens was at least 99.1% in both groups. For all other DTPa-HBV-IPV/Hib vaccine antigens, at least 97.8% of all subjects of both groups were seroprotected. In addition, 99.5% of all subjects had meningococcal C bactericidal antibody titers ≥1/8 and 99.1% ≥1/128. Coadministration of both vaccines did not result in an increased local or general reactogenicity compared with separate administration.Conclusion:Coadministration of the combined DTPa-HBV-IPV/Hib vaccine and the meningococcal C conjugate vaccine during the same vaccination visit was immunogenic and safe.

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