Journal
PEDIATRIC INFECTIOUS DISEASE JOURNAL
Volume 24, Issue 5, Pages 463-464Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/01.inf.0000160955.26151.71
Keywords
Haemophilits influenzae; tetanus toxoid; conjugate vaccine
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IgG antibodies against Haemophilus influenzae type b (Hib) capsular polysaccharide (CPS) and tetanus toxoid (TT) were measured for 53 children, 10 years of age, before and I month after a booster dose of diphtheria-tetanus vaccine (DT). All children had been vaccinated at 3, 5 and 12 months of age with DT and a Hib-TT conjugate. Geometric mean concentrations of Hib CPS serum IgG antibody were 4.16 and 4.30 mu g/mL before and after the DT booster, respectively. The geometric mean concentration of TT IgG antibody increased from 0.09 IU/mL to 4.58 IU/mL (P < 0.001). Hib CPS IgG levels remained well above protective titers for 9 years after 3 doses of Hib-TT appropriately spaced in infancy. A booster dose of TT did not affect Hib CPS antibody concentrations but induced a pronounced IgG response against TT.
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