Abstract

VENTURA, Maria Sidneuma Melo et al. Group B streptococcus colonization in pregnancies with premature labor and/or premature rupture membranes. Arq Med [online]. 2011, vol.25, n.2, pp.61-66. ISSN 2183-2447.

Objective: To identify the prevalence of maternal colonization by Streptococcus B in cases of premature labor and/or premature rupture of membranes, comparing collections with non-selective and selective medium and cultured on blood-agar and agar-CPS and vaginal and anorectal cultures. Method: Cross sectional, prospective study, with collection in 112 pregnant women admitted in the Maternity School Assis Chateaubriand, Federal University of Ceará, between May/2008 and July/2009. Vaginal and anorectal swabs were collected and inoculated, one of each region, in selective medium (Todd-Hewitt) and transport (Stuart), with subsequent cultivation on blood agar or agar-CPS and identification of Streptococcus B by CAMP test, in 71 patients, or by VITEK, in 41 patients. We studied the presence of colonization with socio-demographic, obstetric and clinical factors. To statistical analysis were used mean, standard deviation, confidence interval (CI=95%), prevalence and prevalence ratio with significance if p<0.05. Results: The prevalence of colonization was 4.2% in 71 women and 17% in the other 41, with 20 positive cultures: 12 vaginal and 08 rectal, with 10 patients colonized. There was a significant association with maternal age = 20 years, work at home and urinary tract infection. The colonization of the agar-CPS was higher than that shown on blood-agar. Anorectal and vaginal cultures and in the selective media and transport media were equivalents. Conclusion: The prevalence of Streptococcus B was important in the study population, relating to work at home, maternal age and urinary tract infection. The colonization of the agar-CPS was higher than on blood-agar.

Keywords : prevalence; streptococcus group B; maternal colonization; premature rupture of membranes; preterm labor.

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