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Updated: Aug 7, 2026

A Murine Model of Group B Streptococcus Vaginal Colonization
Published on: November 16, 2016
Early-onset neonatal sepsis in the era of group B streptococcal prevention
R S Baltimore1, S M Huie, J I Meek
1Department of Pediatrics, Emerging Infections Program, Yale University School of Medicine, New Haven, Connecticut 06520-8064, USA. robert.baltimore@yale.edu
Insights
Intrapartum antibiotic prophylaxis for group B streptococcal (GBS) disease did not increase non-GBS or antibiotic-resistant neonatal infections. Continued surveillance is recommended due to fluctuating E. coli resistance rates.
Area of Science:
- Neonatal infectious diseases
- Public health surveillance
- Antibiotic resistance
Background:
- Intrapartum antibiotic prophylaxis (IAP) is used to prevent neonatal group B streptococcal (GBS) disease.
- Concerns exist regarding potential increases in non-GBS or antibiotic-resistant infections due to IAP.
Purpose of the Study:
- To evaluate the impact of IAP on the incidence of non-GBS and antibiotic-resistant early-onset invasive neonatal diseases.
Main Methods:
- Chart review of infants with non-GBS bacteria in blood or spinal fluid from 1996-1999 in Connecticut.
- Inclusion criteria: isolation of bacteria other than GBS from blood or spinal fluid.
Main Results:
- The rate of GBS infections decreased significantly.
- The annual rate of non-GBS sepsis remained stable.
- Ampicillin resistance in E. coli showed fluctuations but no sustained increase.
Conclusions:
- IAP did not lead to an increase in non-GBS early-onset neonatal infections.
- Ongoing surveillance is necessary to monitor E. coli infections and antibiotic resistance.
Objective:
To determine whether intrapartum antibiotic prophylaxis for neonatal group B streptococcal (GBS) disease has resulted in an increased rate of non-GBS or antibiotic-resistant early-onset invasive neonatal disease.
Methods:
Maternal and infant chart review of all infants with bacteria other than GBS isolated from blood or spinal fluid in 1996 through 1999 in 19 hospitals (representing 81% of in-state births to state residents) throughout Connecticut. Suspected cases were identified through clinical microbiology laboratory records or through International Classification of Diseases, Ninth Revision codes when microbiology records were incomplete.
Results:
Ninety-four cases of non-GBS early-onset sepsis or meningitis were detected between 1996 and 1999. The rate of GBS-related early-onset infection (days 0-6 of life) dropped from 0.61/1000 to 0.23/1000 births, but the annual rate of non-GBS sepsis remained steady, ranging from 0.65 to 0.68/1000 during the surveillance period. There was an increase in the proportion of Escherichia coli infections that were ampicillin resistant between 1996 and 1998, but the proportion decreased. in 1999
Conclusion:
There was no increase in the incidence of non-GBS early-onset neonatal infections between 1996 and 1999. Fluctuations in the annual incidence of E coli infections, including ampicillin-resistant infections, suggest the need for continuation of surveillance in Connecticut and expansion to monitor larger populations.
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