Coadministration of RIX4414 Oral Human Rotavirus Vaccine Does Not Impact the Immune Response to Antigens Contained in Routine Infant Vaccines in the United States

This study was conducted to confirm the absence of immune interference of 2 doses of RIX4414 (Rotarix) on routine infant vaccinations in the United States. A total of 484 healthy infants aged 6 to 12 weeks were randomly assigned to 1 of 2 groups to receive 3 doses of Pediarix (combined diphtheria-tetanus-acellular pertussis-hepatitis B-poliovirus vaccine [DTaP-HBV-IPV]), Prevnar (7-valent pneumococcal conjugate vaccine [PCV7]), and ActHIB (Haemophilus influenzae type b conjugate vaccine [Hib]) at 2, 4, and 6 months of age with RIX4414 either coadministered at 2 and 4 months (Co-ad) or administered separately at 3 and 5 months (Sep-ad). Serum antibodies were measured 1 month after dose 3 of the DTaP-HBV-IPV, PCV7, and Hib vaccines. Antibody responses to all antigens were similar in infants in both the Co-ad and Sep-ad groups. Seroprotective antibody concentrations against diphtheria, tetanus, hepatitis B, and poliovirus types 1, 2, and 3 were achieved by >or=97.9% of the infants in both groups. Antipolyribosyl ribitol phosphate antibody levels of >or=1.0 microg/mL were achieved by 88.3% to 89.4% of infants in both groups. In both groups, >or=97.8% of the infants were seropositive for antipertussis antibodies and the 7 pneumococcal serotypes. Predefined criteria for noninferiority between groups were reached for all antigens. Two doses of RIX4414 coadministered with routine infant vaccines as recommended in the United States (DTaP-HBV-IPV, PCV7, and Hib) did not impair the immune response to any of the coadministered antigens.