Group B Streptococcus Positive Culture’s Results in Pregnants with Preterm Premature Rupture of Membranes

Objective: preterm premature rupture of membranes (pprom) occurs in 2% of all pregnancies. the aimof this study was to compare positive cultures of gbs in two groups of pregnant women.materials and methods: this case control research was conducted on 242 pregnant women: first groupwas consisted of 117 pregnant with pprom and gestational ages between 26-37 weeks; second groupwas consisted of 125 term pregnant women with intact membranes and before onset of labor.rectovaginal and urine samples were studied using specific culture medium of gbs, todd hewittbroth. the percentage of positive results was calculated using odds ratio and chi-square test.results: gbs cultures were positive in 20 cases (17%) in pprom group and 5 cases in group of termpregnant (4%) (odds ratio=4.95 ci= 1.79-13.67, p=0.001). past history of preterm labor and neonatehospitalization were more common in pprom group but without any significant relationship to positivecultures.conclusion: our study showed significant difference of gbs colonization rate between two groups(p=0.001). according to cdc and acog guidelines routine screening and treatment of positive casesare indicated.