• bacterial vaginosis;
  • preterm birth;
  • premature rupture of membranes;
  • asymptomatic


Objective: to assess the prevalence of bacterial vaginosis (BV) in asymptomatic pregnant women and its association with preterm birth (PTB) and premature rupture of membranes (PROM).

Methods: In a cohort study 1,006 pregnant women between 16–28 weeks' gestation were screened for BV (Nugent's criteria) and for lower genital tract infection. Women were followed to confirm pregnancy outcome. Data were analyzed using STATA software. Univeriate and multivariate methods were used to investigate the association between bacterial vaginosis and adverse pregnancy outcome.

Results: Prevalence of BV was 11.53%. Baseline characteristics were similar for both groups, 6.8% women were lost to follow-up. Incidence of PTB was higher in BV positive women compared to BV negative women (p = 0.001). On multiple logistic regression (MLR), BV was associated with an increasd risk of PTB (p = 0.001) and PROM (p = 0.001), other correlates being previous PTB (p = 0.003) and the presence of enteropharynangeal organisms in vagina (p = 0.03). BV accounted for 82.53% of the attributable risk for PTB.

Conclusion: Presence of BV in early pregnancy is associated with an increased risk of PTB and PROM. Multicentric interventional study is recommended.