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Perinatal Group B Streptococcal Infections: Virulence Factors, Immunity, and Prevention Strategies

Journal article
Authors J. Vornhagen
Kristina M. Adams Waldorf
L. Rajagopal
Published in Trends in Microbiology
Volume 25
Issue 11
Pages 919-931
ISSN 0966-842X
Publication year 2017
Published at Institute of Clinical Sciences, Department of Obstetrics and Gynecology
Pages 919-931
Language en
Keywords human extraplacental membranes, lactobacillus-reuteri crl1324, human, epithelial-cells, onset neonatal sepsis, rich repeat proteins, alpha-c-protein, vaginal colonization, preterm birth, in-vitro, camp, factor
Subject categories Obstetrics and women's diseases, Clinical bacteriology


Group B streptococcus (GBS) or Streptococcus agalactiae is a beta-hemolytic, Gram-positive bacterium that is a leading cause of neonatal infections. GBS commonly colonizes the lower gastrointestinal and genital tracts and, during pregnancy, neonates are at risk of infection. Although intrapartum antibiotic prophylaxis during labor and delivery has decreased the incidence of early-onset neonatal infection, these measures do not prevent ascending infection that can occur earlier in pregnancy leading to preterm births, stillbirths, or late-onset neonatal infections. Prevention of GBS infection in pregnancy is complex and is likely influenced by multiple factors, including pathogenicity, host factors, vaginal microbiome, false-negative screening, and/or changes in antibiotic resistance. A deeper understanding of the mechanisms of GBS infections during pregnancy will facilitate the development of novel therapeutics and vaccines. Here, we summarize and discuss important advancements in our understanding of GBS vaginal colonization, ascending infection, and preterm birth.

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