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Updated: Mar 16, 2026

A Murine Model of Group B Streptococcus Vaginal Colonization
Published on: November 16, 2016
Avoiding Inadequate Intrapartum Antibiotic Prophylaxis for Group B Streptococci
Sarah Bienenfeld1, Laura G Rodriguez-Riesco, Kent D Heyborne
1Departments of Obstetrics and Gynecology, Denver Health and Hospital Authority, Denver, and the University of Colorado Denver, Aurora, Colorado.
Forty percent of newborns received inadequate group B streptococci (GBS) prophylaxis. Most cases were unavoidable, but timely antibiotic administration and correct selection are key for improving GBS sepsis prevention.
Area of Science:
- Obstetrics and Gynecology
- Neonatal Care
- Infectious Disease Prevention
Background:
- Group B streptococci (GBS) colonization in pregnant women poses a risk of neonatal infection.
- Intrapartum antibiotic prophylaxis is crucial for preventing early-onset GBS disease.
- Adherence to established guidelines, such as those from the Centers for Disease Control and Prevention (CDC), is vital for effective prophylaxis.
Purpose of the Study:
- To determine the incidence of inadequate GBS prophylaxis at an institution.
- To identify the primary reasons for inadequate GBS prophylaxis.
- To assess the proportion of GBS cases that could be prevented by perfect adherence to prophylaxis protocols.
Main Methods:
- Retrospective cohort study analyzing neonates born to GBS-colonized women.
- Maternal charts were reviewed to classify prophylaxis as adequate or inadequate.
- Cases were categorized as avoidable or unavoidable based on timing and eligibility for antibiotics according to 2010 CDC guidelines.
Main Results:
- 40.4% of neonates born to GBS-colonized women received inadequate prophylaxis.
- The majority of inadequate prophylaxis cases (79.7%) were unavoidable, even with perfect protocol adherence.
- Avoidable cases (20.3%) resulted from delayed antibiotic administration (72.5%) or incorrect antibiotic selection (27.5%).
Conclusions:
- A significant proportion of GBS prophylaxis was inadequate, though most cases were unavoidable.
- Improvements in timely antibiotic administration and appropriate antibiotic selection are needed.
- The overall impact of protocol adherence on GBS sepsis prevention may be modest.
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