Antibiotic Prophylaxis in Prelabor Rupture of Membranes at Term

Inclusion Criteria: * term (≥ 37+0 weeks) singleton pregnancy * a vertex presentation * ruptured membranes for less than 12 hours * negative Group B Streptococcus (GBS) culture performed between 35 and 37 weeks Exclusion Criteria: * active labor * absence of GBS culture or indication for GBS antibiotic prophylaxis (such as maternal GBS colonization between 35 and 37 weeks, GBS bacteriuria, prior infant with GBS sepsis) * contraindication to expectant management (such as fetal distress, meconium staining of the amniotic fluid or chorioamnionitis) or to vaginal delivery