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Updated: Jun 12, 2026

A Murine Model of Group B Streptococcus Vaginal Colonization
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Interactions of Lactobacilli with pathogenic Streptococcus pyogenes.

Mark L Westbroek1, Crystal L Davis, Lena S Fawson

  • 1Department of Clinical Laboratory Sciences, Ezekiel R. Dumke College of Health Professions, Weber State University, 3905 University Circle, Ogden, UT 84408-3905, USA. markwestbroek@gmail.com

Infectious Diseases in Obstetrics and Gynecology
|May 29, 2010
PubMed
Summary

Lactobacilli do not inhibit Streptococcus pyogenes growth, nor does S. pyogenes inhibit Lactobacilli. This study found no significant impact of Lactobacillus concentrations on S. pyogenes growth.

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Published on: April 28, 2014

Area of Science:

  • Microbiology
  • Bacteriology

Background:

  • Lactobacilli are key commensal bacteria in the vaginal microbiota.
  • Streptococcus pyogenes is a significant human pathogen.

Purpose of the Study:

  • To investigate the interaction between Lactobacilli and S. pyogenes.
  • To determine if Lactobacilli concentration affects S. pyogenes growth.
  • To assess the potential for S. pyogenes to inhibit Lactobacilli.

Main Methods:

  • Co-culture experiments involving S. pyogenes and two species of Lactobacilli (L. crispatus, L. jensenii) at varying concentrations.
  • Colony counts and pH measurements were performed.
  • Statistical analyses (t-tests, ANOVA) were used for comparison.

Main Results:

  • No significant difference in S. pyogenes colony counts was observed when grown alone versus with Lactobacilli.
  • S. pyogenes growth was not significantly affected by different concentrations of L. crispatus and L. jensenii.
  • No inhibition of Lactobacilli by S. pyogenes was detected.

Conclusions:

  • Lactobacilli do not appear to inhibit the growth of S. pyogenes.
  • S. pyogenes does not inhibit the growth of Lactobacilli.
  • The findings suggest a lack of direct antagonistic interaction between these specific species under the tested conditions.