The Efficacy of Probiotics to Reduce Antepartum Group B Streptococcus Colonization.

Inclusion Criteria: * Healthy adult (≥ 18 years of age) pregnant women who are 28±2 weeks gestation at enrollment \[calculated from the first day of Last Normal Menstrual Period (LNMP) and/or ultrasound (US)\] * With: No obstetric complication\* (e.g., pre-eclampsia, gestational diabetes, multiple gestation) * No fetal complication (e.g., birth defect, intrauterine growth restriction) * No medical complication (e.g., hypertension, diabetes mellitus) * Who do not currently ingest an over the counter probiotic supplement (not including yogurt) * Who can both speak and read English * Who regularly attend prenatal care (defined as not \> 1 prior missed appointment during this pregnancy) * No Hypersensitivity reaction to β-lactam antibiotics Exclusion Criteria: * Those less than 18 years of age * Non-pregnant women * Later in pregnancy than 30 weeks gestation at enrollment \[per LNMP and/or US\] * Those with an obstetric, fetal or medical complication of pregnancy * Pregnant women who have a history of GBS bacteriuria during the current pregnancy or have previously given birth to a GBS affected child * Women who are currently ingesting an over the counter probiotic supplement (except for yogurt) * Women who are planning an elective repeat cesarean birth * Women who do not speak and read English * Women with a history of missing more than one scheduled prenatal visit during this pregnancy * Hypersensitivity reaction to β-lactam antibiotics