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IgG to capsular polysaccharide (CPS) of Streptococcus pneumoniae is thought to provide the greatest degree of protection against pneumococcal disease. Serum obtained at hospital admission from 14 (27%) of 51 patients with bacteremic pneumococcal pneumonia and 11 (37%) of 30 with nonbacteremic pneumococcal pneumonia contained IgG to CPS of the infecting serotype; these percentages are similar to the prevalence of IgG to CPS in a control population. However, when compared with antibody from healthy adults, this IgG had far less capacity to opsonize the infecting pneumococcal serotype for phagocytosis in vitro by normal human polymorphonuclear leukocytes or to protect mice against experimental challenge. Failure to opsonize correlated closely with failure to protect mice, and each of these parameters correlated well with poor avidity for CPS. Future vaccine studies may need to examine the functional capacity of antibodies as a surrogate for infection, in addition to measuring their concentration in serum.

Antibody to Capsular Polysaccharide ofStreptococcus pneumoniaeat the Time of Hospital Admission for Pneumococcal Pneumonia