title: Amniorrhexis lowers the incidence of positive cultures for group B streptococci.
abstract: OBJECTIVE
  Our purpose was to determine the effect of amniorrhexis on cultures for group B streptococci.
  
  
  METHODS
  Intrapartum vaginal cultures for group B streptococci were obtained before and after rupture of membranes in 166 women; in addition, rectal cultures were obtained from the last 35 patients.
  
  
  RESULTS
  Before rupture of membranes 49 of 166 (30%) of the vaginal cultures were positive for group B streptococci; only 28 of 166 (17%) remained positive after rupture of membranes (p = 0.0009). Similarly, before rupture of membranes 10 of 35 (30%) rectal cultures were positive, whereas only three of 35 (0.9%) remained positive for group B streptococci after rupture of membranes (p = 0.03).
  
  
  CONCLUSIONS
  The prevalence of positive genital cultures for group B streptococci is significantly lower immediately after rupture of membranes.
authors.affiliation: Department of Obstetrics and Gynecology, Jack D. Weiler Hospital of the Albert Einstein College of Medicine, Bronx, NY 10461.
authors.forename: C E
authors.initials: CE
authors.lastname: Henderson
authors.forename: H
authors.initials: H
authors.lastname: Egre
authors.forename: R
authors.initials: R
authors.lastname: Turk
authors.forename: V
authors.initials: V
authors.lastname: Aning
authors.forename: G
authors.initials: G
authors.lastname: Szilagyi
authors.forename: M Y
authors.initials: MY
authors.lastname: Divon
mesh_terms: D000650:Amnion; D000653:Amniotic Fluid / Q000378:metabolism; D005260:Female; D006801:Humans; D007743:Labor, Obstetric; D008470:Meconium / Q000378:metabolism; D011247:Pregnancy; D012007:Rectum / Q000382:microbiology*; D012421:Rupture; D013292:Streptococcus agalactiae / Q000302:isolation & purification*; D014621:Vagina / Q000382:microbiology*