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Updated: Jul 16, 2026

A Murine Model of Group B Streptococcus Vaginal Colonization
Published on: November 16, 2016
Perinatal group B streptococcal disease
1Vaccine Institute and Division of Child Health, St George's, University of London, London SW17 0RE, UK. pheath@sgul.ac.uk <pheath@sgul.ac.uk>
Insights
Group B Streptococcus (GBS) causes neonatal sepsis and meningitis. Early antibiotic administration before birth, guided by risk factors or swabs, is crucial for preventing GBS infections in newborns.
Area of Science:
- Obstetrics and Gynecology
- Neonatal Medicine
- Infectious Diseases
Background:
- Group B Streptococcus (GBS) is a primary cause of neonatal sepsis and meningitis.
- Despite treatment, GBS infections lead to significant infant morbidity and mortality.
- Effective prevention strategies are essential to reduce GBS-related adverse outcomes.
Purpose of the Study:
- To review prevention strategies for neonatal Group B Streptococcus infections.
- To highlight the importance of timely antibiotic administration in preventing early-onset GBS disease.
- To compare risk-factor-based versus swab-based screening for GBS.
Main Methods:
- Review of current obstetric and midwifery practices for GBS prevention.
- Analysis of two primary GBS screening strategies: clinical risk factors and late-pregnancy vaginal/rectal swabs.
- Discussion of the efficacy and implications of each prevention approach.
Main Results:
- Antibiotic administration prior to delivery is key to preventing early-onset GBS disease.
- Two main strategies exist for identifying at-risk pregnancies: clinical risk factors or GBS screening via swabs.
- Swab-based screening demonstrates higher efficacy but may increase antibiotic exposure.
Conclusions:
- Prevention of neonatal GBS disease relies heavily on obstetricians and midwives.
- The choice between risk-factor and swab-based strategies involves balancing efficacy with antibiotic stewardship.
- Optimizing GBS prevention requires careful consideration of available screening methods.
Abstract:
Group B streptococcus (GBS) is the leading cause of neonatal sepsis and meningitis. Despite optimal treatment of GBS-infected neonates it is associated with significant morbidity and mortality, and prevention strategies are required. As disease occurs rapidly, and is often evident at birth or within 12 hours of birth, antibiotics must be given prior to delivery, and when administered early enough, and at the correct doses, they will prevent the majority of early-onset GBS cases. Prevention is therefore in the hands of obstetricians and midwives. Women at higher risk of delivering infected infants can be identified through one of two strategies: the presence of one or more clinical risk factors, or the presence of GBS on lower vaginal/rectal swabs obtained late in pregnancy. Decisions on which strategy to use will depend on a number of factors. A swab-based approach appears to have higher efficacy but is likely to lead to more antibiotic exposure.
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