ABNORMAL BACTERIAL-COLONIZATION OF THE GENITAL-TRACT AND SUBSEQUENT PRETERM DELIVERY AND LATE MISCARRIAGE

Objective-To find out whether women with bacterial vaginosis detected early in pregnancy are at increased risk of preterm delivery. Design-P rospective description cohort study. Setting-Antenatal clinic in a dis trict general hospital. Subjects-783 women examined during their first antenatal clinic visit and screened for recognised risk factors for p reterm delivery and the presence of bacterial vaginosis or intermediat e abnormal flora detected by examination of a vaginal smear stained by Gram's method. Main outcome measures-Gestational age at delivery clas sified as late miscarriage (16-24 weeks' gestation), preterm delivery (24-37 weeks' gestation), term delivery (greater-than-or-equal-to 37 w eeks' gestation). Results-Multiple logistic analysis showed that there was an increased incidence of preterm delivery in women with a previo us preterm delivery (9/24; odds ratio 25; 95% confidence interval 9 to 70; P < 0.001) and bacterial vaginosis (9/115; 2.8; 1.1 to 7.4; P = 0 .04). A further logistic analysis of data from women recruited before 16 weeks' gestation showed that preterm deliveries or late miscarriage s occurred more often in women with bacterial vaginosis (12/7; 5.5; 2. 3 to 13.3; P < 0.001). Conclusions-Late miscarriage and preterm delive ry are associated with the presence of bacterial vaginosis in early pr egnancy. This is independent of recognised risk factors such as previo us preterm delivery.