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Objectives  To examine the influence of sexual activity on the composition and consistency of the vaginal microbiota over time, and distribution of  Gardnerella vaginalis  clades in young women.    Methods  Fifty-two participants from a university cohort were selected. Vaginal swabs were self-collected every 3-months for up to 12 months with 184 specimens analysed. The vaginal microbiota was characterised using Roche 454 V3/4 region 16S rRNA sequencing, and  G . vaginalis  clade typing by qPCR.    Results  A  Lactobacillus crispatus  dominated vaginal microbiota was associated with Caucasian ethnicity (adjusted relative risk ratio[ARRR] = 7.28, 95%CI:1.37,38.57, p  = 0.020). An  L . iners  (ARRR = 17.51, 95%CI:2.18,140.33, p  = 0.007) or  G . vaginalis  (ARRR = 14.03, 95%CI:1.22,160.69,  p  = 0.034) dominated microbiota was associated with engaging in penile-vaginal sex. Microbiota dominated by  L . crispatus ,  L . iners  or other lactobacilli exhibited greater longitudinal consistency of the bacterial communities present compared to ones dominated by heterogeneous non-lactobacilli ( p <0.030); sexual activity did not influence consistency. Women who developed BV were more likely to have clade GV4 compared to those reporting no sex/practiced non-coital activities (OR = 11.82, 95%CI:1.87,74.82, p  = 0.009). Specimens were more likely to contain multiple  G . vaginalis  clades rather than a single clade if women engaged in penile-vaginal sex (RRR = 9.55, 95%CI:1.33,68.38, p  = 0.025) or were diagnosed with BV (RRR = 31.5, 95%CI:1.69,586.87, p  = 0.021).    Conclusions  Sexual activity and ethnicity influenced the composition of the vaginal microbiota of these young, relatively sexually inexperienced women. Women had consistent vaginal microbiota over time if lactobacilli were the dominant spp. present. Penile-vaginal sex did not alter the consistency of microbial communities but increased  G . vaginalis  clade diversity in young women with and without BV, suggesting sexual transmission of commensal and potentially pathogenic clades.

The influence of sexual activity on the vaginal microbiota and Gardnerella vaginalis clade diversity in young women