Archives of Gynecology and Obstetrics

, Volume 283, Issue 4, pp 717–721

Group B streptococci colonization in pregnant women: risk factors and evaluation of the vaginal flora

  • Talita T. Rocchetti
  • Camila Marconi
  • Vera L. M. Rall
  • Vera T. M. Borges
  • José E. Corrente
  • Márcia G. da Silva
Materno-fetal Medicine

DOI: 10.1007/s00404-010-1439-8

Cite this article as:
Rocchetti, T.T., Marconi, C., Rall, V.L.M. et al. Arch Gynecol Obstet (2011) 283: 717. doi:10.1007/s00404-010-1439-8

Abstract

Objective

To determine the prevalence of group B streptococci (GBS) in our population, and to assess the association between risk factors and vaginal flora with maternal rectovaginal colonization.

Method

Samples were obtained from 405 patients between 35 and 37 weeks of gestation. Swabs from the vaginal and perianal regions were cultured in Todd Hewitt and subcultured in blood agar. Colonies suggestive of GBS were submitted to catalase and CAMP test. The vaginal flora was evaluated on Gram stain vaginal smears. Socio-demographic and obstetric data were obtained by designed form. Considering maternal GBS colonization as the response variable, a logistic regression model was fitted by the stepwise method with quantitative and qualitative explanatory variables.

Results

The prevalence of GBS colonization was 25.4%. The most frequent vaginal flora abnormalities were cytolytic vaginosis (11.3%), followed by bacterial vaginosis (10.9%), candidosis (8.2%) and intermediate vaginal flora II (8.1%). Logistic regression analysis revealed that maternal age, number of sexual intercourse/week, occurrence of previous spontaneous abortion, presence of candidosis and cytolytic vaginosis were associated with streptococcal colonization.

Conclusion

The prevalence of GBS is high in pregnant women and is associated with sexual intercourse frequency, previous spontaneous abortion and the presence of candidosis or cytolytic vaginosis.

Keywords

Group B streptococciPregnancyVaginal floraRisk factors

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Talita T. Rocchetti
    • 1
  • Camila Marconi
    • 1
  • Vera L. M. Rall
    • 2
  • Vera T. M. Borges
    • 3
  • José E. Corrente
    • 4
  • Márcia G. da Silva
    • 1
  1. 1.Department of Pathology, Botucatu Medical SchoolSão Paulo State University, UNESPBotucatuBrazil
  2. 2.Department of Microbiology and Immunology, Institute of BiosciencesSão Paulo State University, UNESPBotucatuBrazil
  3. 3.Department of Gynecology and Obstetrics, Botucatu Medical SchoolSão Paulo State University, UNESPBotucatuBrazil
  4. 4.Department of Biostatistics, Institute of BiosciencesSão Paulo State University, UNESPBotucatuBrazil