intrapartum effect of vancomycin on rectovaginal gbs colonization

Conditions: Group B Streptococcal Infection

Summary: the aim of this project is to identify the duration of vancomycin administration at which group b streptococcus (gbs) colonization is eradicated from the vaginal and recto-vaginal mucosa. this will aid in labor management and delivery planning to ensure that the mother receives adequate gbs prophylaxis while also minimizing the duration of exposure to vancomycin. in addition, this could prevent unnecessary prolonged hospitalization or septic workup of neonates whose mothers received vancomycin intrapartum. this study aims to identify the time after administration of iv vancomycin at which gbs colonies are 100% eradicated.

prophylaxis of group b streptococcus has been a major component of prenatal care in preventing early onset of neonatal sepsis. while penicillin remains the gold standard medication for prophylaxis, this medication is not an option in women who have high risk allergic reactions to this class of medications. furthermore, with rising rates of antibiotic resistance to erythromycin and clindamycin, more women are requiring vancomycin for gbs prophylaxis. while the cdc and acog recommend vancomycin as an alternative to penicillin for gbs prophylaxis, little research has been conducted investigating the transplacental passage of vancomycin. because of the gap in knowledge regarding intrapartum effects of iv vancomycin on gbs colonization, neonates of women who received vancomycin are considered as inadequately treated for gbs prophylaxis, and subsequently undergo additional observation, prolonged hospitalization, and possible septic workup in the immediate postpartum period. because of this gap in knowledge, this research study investigates how quickly vaginal and recto-vaginal gbs colonization is eradicated to aid in timing of delivery in patients with gbs colonization who require vancomycin intrapartum. in addition, the studies that investigated the duration of time of iv penicillin and iv clindamycin necessary for eradication of gbs colonization only investigated vaginal colonization, not recto-vaginal colonization. their rationale was based on the assumption that most cases of neonatal gbs sepsis are caused by vaginal colonization. given that the standard of care for gbs screening includes screening for colonization of both vaginal and rectal mucosa, investigators also plan to compare rates of eradication of gbs in vaginal colonies compared to recto-vaginal colonies.

Eligibility criteria:
vancomycin arm inclusion criteria * women aged 18 years or older * pregnancies of at least 37w0d gestation at delivery * history of high-risk allergy to penicillin (including pruritic rash, urticaria, swelling, anaphylaxis) * women who are gbs positive * culture proven resistance or * unknown resistance to clindamycin or erythromycin exclusion criteria * women with low risk allergy to penicillin * history of allergy to vancomycin * history of red man syndrome * history of renal or hepatic disease * immunocompromised patients * history of chronic steroid use in current pregnancy * patient with fever or signs of chorioamnionitis on admission penicillin arm inclusion criteria * women aged 18 years or older * women who are gbs positive * pregnancies of at least 37w0d gestation at delivery exclusion criteria * immunocompromised patients * history of chronic steroid use in current pregnancy * patient with fever or signs of chorioamnionitis on admission

Keywords: vancomycin penicillin clindamycin group b streptococcal infection rectovaginal gbs colonization vaginal gbs colonization intrapartum prophylaxis