Effect of Sexual Activity on Vaginal Colonization with Hydrogen Peroxide-producing Lactobacilli and Gardnerella Vaginalis

Overview

Journal Sex Transm Dis

Specialty Infectious Diseases

Date 2011 Nov 16

PMID 22082725

Citations 13

Authors

Caroline Mitchell

Lisa E Manhart

Katherine K Thomas

Kathy Agnew

Jeanne M Marrazzo

Affiliations

Soon will be listed here.

Abstract

Background: Bacterial vaginosis is associated with sexual activity, but mechanisms for this association are unclear.

Study Design: Cross-sectional analysis of data from women reporting sex with women who provided information on sexual behaviors as part of a study of vaginal bacteria was conducted. Vaginal bacteria were detected by semiquantitative culture. Binomial regression with log-link evaluated associations between detection of bacteria and sexual behaviors reported to occur before enrollment. Linear regression evaluated associations between these behaviors and quantity of bacteria.

Results: Of the 320 women, 216 (68%) were colonized with H2O2-producing lactobacilli and 142 (44%) with Gardnerella vaginalis. Colonization with G. vaginalis was associated with >20 digital-vaginal sex acts (risk ratio, 2.01; 1.22, 3.29) or >10 toy-vaginal acts in the past 3 months (risk ratio, 1.76; 1.32, 2.36). Quantity of H2O2-producing lactobacilli was 1.3 log lower in colonized women reporting >10 acts of insertive vaginal sex-toy use in the past 3 months (95% confidence interval: -2.04, -0.56), 1.19 log lower with toy-vaginal sex in past 7 days (-1.75, -0.62), and 0.78 log lower in women sharing toys with a partner (-1.25, -0.31).

Conclusions: Vaginal insertive use and sharing of sex toys were associated with decreased quantities of H2O2-producing lactobacilli and higher risk of colonization with G. vaginalis.

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