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J Clin Microbiol. Feb 1989; 27(2): 251–256.
PMCID: PMC267286

Prevalence of hydrogen peroxide-producing Lactobacillus species in normal women and women with bacterial vaginosis.

Abstract

A predominance of Lactobacillus species in the vaginal flora is considered normal. In women with bacterial vaginosis, the prevalence and concentrations of intravaginal Gardnerella vaginalis and anaerobes are increased, whereas the prevalence of intravaginal Lactobacillus species is decreased. Because some lactobacilli are known to produce hydrogen peroxide (H2O2), which can be toxic to organisms that produce little or no H2O2-scavenging enzymes (e.g., catalase), we postulated that an absence of H2O2-producing Lactobacillus species could allow an overgrowth of catalase-negative organisms, such as those found among women with bacterial vaginosis. In this study, H2O2-producing facultative Lactobacillus species were found in the vaginas of 27 (96%) of 28 normal women and 4 (6%) of 67 women with bacterial vaginosis (P less than 0.001). Anaerobic Lactobacillus species (which do not produce hydrogen peroxide) were isolated from 24 (36%) of 67 women with bacterial vaginosis and 1 (4%) of 28 normal women (P less than 0.001). The production of H2O2 by Lactobacillus species may represent a nonspecific antimicrobial defense mechanism of the normal vaginal ecosystem.

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Selected References

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