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Updated: Jun 5, 2026

A Murine Model of Group B Streptococcus Vaginal Colonization
Published on: November 16, 2016
[Breast milk as a cause of group B streptococcal sepsis]
Helle Christiansen1, Helle Leth
1Børneafdelingen, Hvidovre Hospital, 2650 Hvidovre, Denmark. hellec@dadlnet.dk
Insights
Group B Streptococcus (GBS) causes serious neonatal infections. This study highlights breast milk as a potential source of late-onset GBS sepsis in premature infants, emphasizing the need for investigation.
Area of Science:
- Neonatal Medicine
- Infectious Diseases
- Microbiology
Background:
- Group B beta-haemolytic streptococci (GBS) are a leading cause of serious neonatal bacterial infections.
- Neonatal GBS sepsis presents as early-onset (days 1-6) or late-onset (after day 6), with increased incidence in premature and low-birth-weight infants.
Observation:
- Three cases of sepsis in premature infants nourished with mother's milk are presented.
- These cases highlight a potential link between breast milk and neonatal GBS infection.
- The infants experienced late-onset GBS sepsis.
Findings:
- The study suggests that breast milk may serve as a reservoir for GBS transmission to neonates.
- Mother's milk was identified as a potential source of infection in the described cases.
- This challenges previous assumptions about GBS pathogenesis in neonates.
Implications:
- Investigating breast milk for GBS colonization should be considered in cases of late-onset neonatal sepsis.
- This finding may lead to revised diagnostic and preventative strategies for neonatal GBS infections.
- Understanding transmission routes is vital for protecting vulnerable premature infants from severe bacterial infections.
Abstract:
Group B beta-haemolytic streptococci (GBS) are the most common cause of serious bacterial infection in the neonate. Neonatal GBS sepsis is divided into early onset (1st- 6th day) and late onset (LO) (after 6th day of life). The incidence of both is increased in premature infants and infants with a low birth weight. The pathogenesis of LO GBS sepsis is poorly elucidated. Breast milk has been suggested as a source of infection. We describe three cases of sepsis in a premature girl nourished with mother's milk which illustrate the importance of investigating breast milk as a source of infection.
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