Bacterial Vaginosis Pathogenesis and Risk Factors

Primary Pathophysiologic Mechanism

The Centers for Disease Control and Prevention, as reported by MMWR Recommendations and Reports, suggests that bacterial vaginosis results from a disruption of the normal vaginal ecosystem where protective Lactobacillus species are displaced by pathogenic organisms, including a loss of protective Lactobacillus and anaerobic bacterial overgrowth 3, 4
The normal vaginal ecosystem is maintained by H₂O₂-producing Lactobacillus species that produce lactic acid, hydrogen peroxide, and bacteriocin, which are replaced in bacterial vaginosis, as noted by Praxis Medical Insights 1, 2

The MMWR Recommendations and Reports indicate that multiple sexual partners are strongly associated with bacterial vaginosis, though it remains unclear whether the condition results from acquisition of a sexually transmitted pathogen 3, 4
Women who have never been sexually active are rarely affected by bacterial vaginosis, according to the MMWR Recommendations and Reports 3, 4
Treatment of male sexual partners has not been beneficial in preventing bacterial vaginosis recurrence, suggesting it may not be a classic sexually transmitted infection, as reported by Praxis Medical Insights and MMWR Recommendations and Reports 2, 3, 5

Menstrual cycle changes can trigger bacterial vaginosis through hormonal alterations that affect cervical barriers and reduce the bacteriostatic effect of cervical mucus, as noted by Praxis Medical Insights 5

Up to 50% of women with bacterial vaginosis are asymptomatic, so absence of symptoms does not exclude the diagnosis, according to the MMWR Recommendations and Reports and Praxis Medical Insights 2, 3
Bacterial vaginosis is not simply a sexually transmitted infection, despite its association with sexual activity, as reported by the MMWR Recommendations and Reports 3
The condition has a high recurrence rate (50-80% within one year), likely because beneficial Lactobacillus species fail to recolonize after antibiotic treatment, as noted by Praxis Medical Insights 2