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  • Title: Antibody response of Navajo children primed with PRP-OMP vaccine to booster doses of PRP-OMP vs. HbOC vaccine.
    Author: Reid R, Santosham M, Croll J, Thompson C, Newcomer W, Siber GR.
    Journal: Pediatr Infect Dis J; 1993 Oct; 12(10):812-5. PubMed ID: 8284116.
    Abstract:
    We compared in 12- to 15-month-old American Indian infants the safety and immunogenicity of two licensed Haemophilus influenzae type b (Hib) conjugate vaccines, PRP-OMP (PedvaxHib) and HbOC (HibTITER), administered as booster vaccinations. All infants previously received PRP-OMP for their primary Hib vaccinations at 2 and 4 months of age. The geometric mean Hib antibody concentrations (microgram/ml) measured by radioactive antigen-binding assay for those receiving PRP-OMP (n = 17) or HbOC (n = 18) were 0.593 and 0.449, respectively, before boosting (P not significant) and 7.46 and 29.5 micrograms/ml, respectively, after boosting (P < 0.05). PRP-OMP recipients also had lower geometric mean IgG anti-Hib antibody concentrations than HbOC recipients (7.21 vs 28 micrograms/ml, P = 0.003) and lower bactericidal titers (3.18 vs. 15.4, not significant). We conclude that HbOC vaccine produced a significantly greater booster response than PRP-OMP vaccine when given at 12 to 15 months of age to children primed with two doses of PRP-OMP vaccine at 2 and 4 months of age.
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