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Updated: Apr 16, 2026

A Murine Model of Group B Streptococcus Vaginal Colonization
Published on: November 16, 2016
Screening and management of maternal colonization with Streptococcus agalactiae: an Italian cohort study
Carmen De Luca1, Natalina Buono1, Vincenzo Santillo2
1a Department of Obstetrics and Gynaecology , Policlinico A. Gemelli, Catholic University of Sacred Heart , Rome , Italy .
Insights
Group B Streptococcus (GBS) screening and intrapartum antibiotic prophylaxis (IAP) are crucial for preventing infant infections. Inadequate screening and IAP in this study led to increased early-onset GBS disease in newborns.
Area of Science:
- Obstetrics and Gynecology
- Neonatal Health
- Infectious Disease Prevention
Background:
- Group B Streptococcus (GBS) is a leading cause of neonatal sepsis and meningitis.
- Intrapartum antibiotic prophylaxis (IAP) effectively prevents GBS transmission to newborns.
- CDC guidelines recommend GBS screening via vaginal and rectal cultures at 35-37 weeks gestation.
Purpose of the Study:
- To evaluate the adherence to GBS screening and IAP guidelines.
- To assess the impact of screening and IAP on neonatal outcomes.
Main Methods:
- Retrospective analysis of 535 women admitted for delivery at Cardarelli Hospital.
- Evaluation of GBS screening completion, colonization rates, IAP indications, and execution.
- Assessment of neonatal outcomes.
Main Results:
- Only 51.5% of women underwent correct GBS screening.
- 30.2% of women were colonized with GBS.
- 50% of women with IAP indications received adequate treatment.
Conclusions:
- Inadequate GBS screening and IAP contribute to increased early-onset GBS disease in newborns.
- Routine vaginal and rectal GBS screening at 35-37 weeks gestation is essential.
- Public health initiatives for surveillance and education are needed to reduce neonatal GBS infections.
Introduction:
Streptococcus agalactiae (Group B streptococcus [GBS]) is the most common cause of sepsis and meningitis in infants <3 months of age. Intrapartum antibiotic prophylaxis (IAP) is effective in preventing the transmission of GBS to newborns. The Centers for Disease Control and Prevention (CDC) guidelines suggest vaginal and rectal cultures to assess GBS colonization between 35 and 37 weeks' gestation.
Methods:
Between July and December 2013, we identified 535 women admitted to the Obstetric and Gynecology Unit of Cardarelli Hospital (Campobasso, Italy) for delivery. We evaluated the indications for IAP, complete execution of IAP, and neonatal outcomes.
Results:
Our sample included 468 women and 475 live births. Correct screening for GBS was executed in 241 cases (51.5%), the number of women colonized was 96 (30.2%), and 136 women had indications to receive IAP, but only 68 (50%) received adequate treatment.
Conclusions:
GBS colonization status should be determined by collecting both vaginal and rectal specimens at 35-37 weeks' gestation. Inadequate screening for GBS and incorrect IAP led to an increased incidence of early-onset disease in newborns. Local public health agencies should promote surveillance and educational programs to prevent neonatal GBS infections.
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