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Updated: May 10, 2026

A Murine Model of Group B Streptococcus Vaginal Colonization
Published on: November 16, 2016
Accuracy of prenatal culture in predicting intrapartum group B streptococcus colonization status
Carlos Florindo1, Vera Damião, Jorge Lima
1National Institute of Health , Lisbon , Portugal .
Objective:
To evaluate the positive predictive value (PPV) of group B Streptococcus (GBS) cultures at 35-37 weeks of gestation relative to GBS colonization status at delivery.
Methods:
Rectovaginal swabs from 221 women at labor in four Lisbon hospitals were collected for GBS screening according to the CDC guidelines.
Results:
The PPV was 24.4%. IAP was administered to 100% of prenatally GBS positive women. There was no case of early onset GBS disease (EOD).
Conclusions:
Poor accuracy of prenatal cultures in identifying true candidates for IAP highlights the need for Portuguese clinical and laboratory guidelines to prevent EOD and antibiotic overtreatment of pregnant women.
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