Association of Atopobium vaginae, a recently described metronidazole resistant anaerobe, with bacterial vaginosisReportar como inadecuado

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BMC Infectious Diseases

, 4:5

First Online: 13 February 2004Received: 28 October 2003Accepted: 13 February 2004


BackgroundBacterial vaginosis BV is a polymicrobial syndrome characterized by a change in vaginal flora away from predominantly Lactobacillus species. The cause of BV is unknown, but the condition has been implicated in diverse medical outcomes. The bacterium Atopobium vaginae has been recognized only recently. It is not readily identified by commercial diagnostic kits. Its clinical significance is unknown but it has recently been isolated from a tuboovarian abcess.

MethodsNucleotide sequencing of PCR amplified 16S rRNA gene segments, that were separated into bands within lanes on polyacrylamide gels by denaturing gradient gel electrophoresis DGGE, was used to examine bacterial vaginal flora in 46 patients clinically described as having normal Lactobacillus spp. predominant; Nugent score ≤ 3 and abnormal flora Nugent score ≥ 4. These women ranged in age from 14 to 48 and 82% were African American.

ResultsThe DGGE banding patterns of normal and BV-positive patients were recognizably distinct. Those of normal patients contained 1 to 4 bands that were focused in the centre region of the gel lane, while those of BV positive patients contained bands that were not all focused in the center region of the gel lane. More detailed analysis of patterns revealed that bands identified as Atopobium vaginae were present in a majority 12-22 of BV positive patients, while corresponding bands were rare 2-24 in normal patients. P < 0.001 Two A. vaginae isolates were cultivated from two patients whose DGGE analyses indicated the presence of this organism. Two A. vaginae 16S rRNA gene sequences were identified among the clinical isolates. The same two sequences were obtained from DGGE bands of the corresponding vaginal flora. The sequences differed by one nucleotide over the short ~300 bp segment used for DGGE analysis and migrated to slightly different points in denaturing gradient gels. Both isolates were strict anaerobes and highly metronidazole resistant.

ConclusionThe results suggest that A. vaginae may be an important component of the complex bacterial ecology that constitutes abnormal vaginal flora. This organism could play a role in treatment failure if further studies confirm it is consistently metronidozole resistant.

Electronic supplementary materialThe online version of this article doi:10.1186-1471-2334-4-5 contains supplementary material, which is available to authorized users.

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Autor: Michael J Ferris - Alicia Masztal - Kenneth E Aldridge - J Dennis Fortenberry - Paul L FidelJr - David H Martin


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