Compare anticapsular antibody levels against Group B Streptococcus at delivery in mothers and their infants who develop disease versus those who do not. Use this comparison to establish antibody levels associated with reductions in risk of GBS disease in infants aged less than 90 days.
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Risk of early onset Group B Steptococcus disease (due to serotypes Ia or III) with respect to maternal or newborn anticapsular antibody levels at delivery.
Timeframe: Birth to 6 days of age