Anti-pneumococcal antibody levels three to seven years after first booster immunization in children with sickle cell disease, and after a second booster.
1995
Abstract We measured pneumococcal antibody levels in 55 patients (ages 7 to 20 years) with sickle cell disease 3 to 7 years after the first booster immunization. Only 6 of the children had protective levels of antibodies (>300 ng/ml) against all 12 serotypes tested. Thirty-two children (58%) had suboptimal levels against 1 to 3 serotypes; 17 had suboptimal levels against 4 to 10 serotypes. Ten patients from the latter group (ages 13 to 17 years) received a second booster 6 to 8 years after the first booster immunization, and had a marked increase in antibody levels against all serotypes with the exception of serotypes 3 and 4 in two patients and serotype 6A in one patient. (J P EDIATR 1995;127:590-2)
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