Amniorrhexis lowers the incidence of positive cultures for group B streptococci.
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.
Henderson
C E
CE
Department of Obstetrics and Gynecology, Jack D. Weiler Hospital of the Albert Einstein College of Medicine, Bronx, NY 10461.
Egre
H
H
Turk
R
R
Aning
V
V
Szilagyi
G
G
Divon
M Y
MY
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*