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Temporal Variability of Human Vaginal Bacteria and Relationship with Bacterial Vaginosis
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Temporal Variability of Human Vaginal Bacteria and Relationship with Bacterial Vaginosis
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Journal Article
Temporal Variability of Human Vaginal Bacteria and Relationship with Bacterial Vaginosis
2010
Overview
Little is known about short-term bacterial fluctuations in the human vagina. This study used PCR to assess the variability in concentrations of key vaginal bacteria in healthy women and the immediate response to antibiotic treatment in women with bacterial vaginosis (BV).
Twenty-two women assessed for BV using Amsel's criteria were evaluated daily for 7 or 14 days, then at 2, 3 and 4 weeks, using a panel of 11 bacterium-specific quantitative PCR assays. Participants with BV were treated with 5 days of intravaginal metronidazole. Participants without BV had vaginal biotas dominated by lactobacilli, whose levels fluctuated with menses. With onset of menstruation, quantities of Lactobacillus jensenii and Lactobacillus crispatus decreased and were found to be inversely related to Gardnerella vaginalis concentrations (p<0.001). Women with BV had a variety of fastidious bacteria whose concentrations dropped below detection thresholds 1-5 days after starting metronidazole. Recurrent BV was characterized by initial profound decreases of BV-associated bacteria after treatment followed by subsequent increases at relapse.
The microbiota of the human vagina can be highly dynamic. Healthy women are colonized with Lactobacillus species, but levels can change dramatically over a month. Marked increases in G. vaginalis were observed during menses. Participants with BV have diverse communities of fastidious bacteria that are depleted by vaginal metronidazole therapy. Women with recurrent BV initially respond to antibiotic treatment with steep declines in bacterial concentrations, but these bacteria later reemerge, suggesting that antibiotic resistance in these bacteria is not an important factor mediating BV recurrence.
Publisher
Public Library of Science,Public Library of Science (PLoS)
Subject
/ Bacteria
/ Cancer
/ DNA
/ Female
/ Gardnerella vaginalis - isolation & purification
/ Humans
/ Infectious Diseases/Bacterial Infections
/ Infectious Diseases/Gynecologic Infections
/ Infectious Diseases/Sexually Transmitted Diseases
/ Lactobacillus - isolation & purification
/ Metronidazole - administration & dosage
/ Microbiology/Medical Microbiology
/ Microbiota (Symbiotic organisms)
/ Sexually transmitted diseases
/ STD
/ Vaccines
/ Vagina
/ Vaginosis, Bacterial - microbiology
/ Women's Health/Gynecologic Inflammation and Infections
