Development of IgM Antibody to Group B Streptococcus Type III in Human Infants

Abstract
An ELISA was developed to measure IgM antibody to albumin-coupled native capsular polysaccharide of type III group B streptococcus (GBS). The assay was standardized by two doublelabel methods that agreed within 33%. In quantitative assays, the range of IgM antibody to type III GBS in the sera of94 adult pregnant women was 1.2–50.6 µg/ml (median, 5.4), while each of 38 cord serum samples contained 7 months of age. The acquisition of specific IgM antibody is inversely correlated with the age-limited incidence of type III GBS infections in young children.

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