title: Group B streptococcus: prevalence in a non-obstetric population.
abstract: OBJECTIVE
  To establish and compare the prevalence of group B streptococcus (GBS) colonization in the vaginas of nonobstetric women with and without vaginitis.
  
  
  METHODS
  Cross-sectional analysis GBS vaginal culture status of nonpregnant, estrogen-replete women 18 years or older presenting for annual gynecological examinations or vaginal infection. Subjects were classified into 3 groups: no vaginitis if symptoms were absent and examination results was normal; common vaginitis (CV) if microscopic examination revealed yeast, bacterial vaginosis, or trichomonads; or inflammatory vaginitis (IV) if examination revealed inflammation and immature squamous cells but no pathogens.
  
  
  RESULTS
  Of the 215 women recruited, 147 (68.4%) showed no evidence of vaginitis, 41 (19.1%) had CV, and 27 (12.6%) showed evidence of IV. The overall prevalence rate of GBS was 22.8%. Vaginitis was associated with a significantly increased risk of GBS colonization (adjusted odds ratio: CV = 2.7, 95% CI = 1.1-6.2; IV = 2.9, 95% CI = 1.1-8.0). Logistic regression revealed pH higher than 4.5, presence of abnormal discharge on examination, and a women's complaint of current symptoms as significant predicators of the presence of GBS.
  
  
  CONCLUSIONS
  Group B streptococcus colonization occurs more commonly in women with vaginitis. This suggests that disruption of the normal vaginal bacterial environment is an important predictor for GBS colonization.
authors.affiliation: Department of Obstetrics and Gynecology, Oregon Health & Sciences University, Portland, OR 97239, USA. leclairc@ohsu.edu
authors.forename: Catherine M
authors.initials: CM
authors.lastname: Leclair
authors.forename: Ashley E
authors.initials: AE
authors.lastname: Hart
authors.forename: Martha F
authors.initials: MF
authors.lastname: Goetsch
authors.forename: Heather
authors.initials: H
authors.lastname: Carpentier
authors.forename: Jeffrey T
authors.initials: JT
authors.lastname: Jensen
mesh_terms: D000293:Adolescent; D000328:Adult; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008875:Middle Aged; D015995:Prevalence; D013290:Streptococcal Infections / Q000453:epidemiology* / Q000382:microbiology*; D013292:Streptococcus agalactiae / Q000302:isolation & purification*; D014621:Vagina / Q000382:microbiology; D014627:Vaginitis / Q000453:epidemiology* / Q000382:microbiology*; D055815:Young Adult