Oral Probiotic Supplementation and Group B Streptococcus Rectovaginal Colonization in Pregnant Women: a Randomized Double-blind Placebo-controlled Trial.

The investigators wish to determine if oral probiotic supplementation during the second half of pregnancy decreases maternal GBS recto-vaginal colonization at 35-37 weeks' gestational age, thereby decreasing need for maternal antibiotic administration at time of labor. The importance of this study is that it may offer a safer alternative to antibiotic treatment of group B Streptococcus (GBS) colonized pregnant women.

Stanford is now accepting new patients for this trial. Please contact Cynthia Willson, RN at 650-724-6372 for more information.



  • dietary supplement : Probiotic dietary supplement
  • dietary supplement : Placebo

Phase: Phase 1/Phase 2


Ages Eligible For Study:

18 Years - 55 Years

Inclusion Criteria

1. Pregnant women between 20-28 weeks gestation. 2. 18 years of age or older. 3. Singleton gestation.

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Contact information

Primary Contact:

Cynthia Willson, RN 650-724-6372

Stanford University School of Medicine 300 Pasteur Drive Stanford, CA 94305

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