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Overview of antibody-mediated immunity to S. pneumoniae: pneumococcal infections, pneumococcal immunity assessment, and recommendations for IG product evaluation.
Transfusion 2018 December
Streptococcus pneumoniae (S. pneumoniae) strains colonize the nasopharynx and can cause mucosal infections in the upper airway and middle ear, pneumonias, and invasive infections like bacteremia, sepsis, and meningitis. Over 90 serotypes, defined by the structure of their capsular polysaccharides, are known. Twenty-three of these serotypes cause most infections and several of these serotypes can develop antibiotic resistance. Susceptibility factors that increase the susceptibility to S. pneumoniae mucosal and invasive infections include all forms of primary and secondary antibody deficiencies. Many patients affected by one of these deficiencies benefit from the regular administration of human gamma globulin (IgG) preparations. Donors of plasma units used to prepare human IgG have varying concentrations of IgG antibodies against relevant S. pneumoniae serotypes. These antibodies are developed in response to colonization and common subclinical infections and by routine vaccination with S. pneumoniae polysaccharide vaccines. The presence of an adequate concentration of these protective antibodies against all prevalent serotypes needs to be determined to assure the effectiveness of human IgG. All presently available methods to assess IgG antibodies against S. pneumoniae capsular polysaccharides have advantages and pitfalls that are analyzed in this review. In vitro testing does not provide a complete or necessarily accurate measurement of the effectiveness of antibodies in vivo. For regulatory purposes, caution needs to be used in the interpretation of currently available assays that measure pneumococcal antibody levels. Monitoring S. pneumoniae infections in patients treated with IgG and tracing information about IgG lots used to treat these patients should be encouraged.
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