Effects of Oral Probiotic Supplementation on Group B Strep (GBS) Rectovaginal Colonization in Pregnancy

1. Screening: All pregnant women prior to 28 weeks gestational age. Patients who choose to enroll and who will not deliver at Lucile Packard Childrens Hospital at Stanford will sign release of medical information forms for study personnel to access pregnancy outcomes. Patients receiving obstetric care at any of the satellite research sites in Santa Cruz will also be offered enrollment in the study. 2. Women will continue regular and routine obstetric care and clinic visits. 3. Placebo vs probiotic daily regimen: We plan to begin administration of product and placebo at 20 weeks gestation, and no later than 28 weeks gestation until delivery. Once a women is enrolled in the study, she will be randomized to either the placebo or the probiotic group. 4. At the time of randomization, the patient will receive her month supply of 30 capsules; The allocation arm will be double-blinded. 5. The investigators will schedule the women for routine monthly obstetric visits (more often if clinically required) during which time they will also meet with one of the investigators. The investigator at each monthly visit will provide an additional monthly allotment of 30 capsules. The capsule bottle from the previous cycle will be collected and dated if there are capsules remaining in the bottle. Remaining capsules will be counted and refrigerated for future use. 6. The investigators will collect history data including safety data per the questionnaire and will document compliance with the study. 7. GBS recto-vaginal screening: The investigators will enroll the women in the study and we will perform the standard GBS colonization screening (using standard GBS recto-vaginal cultures) at 36 weeks. 8. Additionally, subjects may opt to have serial vaginal swabs collected to assess potential beneficial effects of probiotics on the vaginal microbiota and bacterial vaginosis (BV) status. Vaginal swabs will be collected (either by study personnel or self-collected by the study participant). Swabs will be inserted 1-2 inches into the vaginal introitus and spun for 20 seconds and then withdrawn. Swabs will be collected at the following time points: prior to probiotic/placebo initiation, every 1-4 weeks from time of enrollment to time of delivery, and postpartum serially up to 12 months. These swabs will be stored at -20 degrees Celsius or colder for additional microbiologic analyses. 9. Additionally, placental tissue may be collected at time of delivery for possible future microbiome and/or other analyses. 10. Women who suffer a premature rupture of the membranes, deliver before 36 weeks gestation, or go into labor before the GBS culture result is available, will receive the standard GBS antibiotic prophylaxis. 11. Labor: The patient will receive standard delivery and newborn care. Patients with a positive GBS culture will be treated with standard antibiotics in labor. 12. Postpartum and neonatal care: The patient will receive routine postpartum care per the obstetric team. Data regarding her postpartum course and neonatal outcomes will be collected.