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Mycoplasma hominis and Gardnerella vaginalis display a significant synergistic relationship in bacterial vaginosis

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Abstract

Gardnerella vaginalis plays an important role in bacterial vaginosis (BV,) while the role of genital Mollicutes is less obvious. The diagnosis of BV by use of the current Gram stain Nugent score is also suboptimal for defining the role of Mollicutes that lack a cell wall. Since bacterial load and diversity is an important prerequisite for BV, real-time quantitative polymerase chain reaction (qPCR) assays enable these to be assessed. The purpose of this study was to define the role of genital Mollicutes and potential patterns of synergy with G. vaginalis in women with BV. Vaginal swabs from 130 women categorised by Nugent score as BV (n = 28), intermediate (n = 22) and non-BV (n = 80) were tested against four qPCR TaqMan assays targeting G. vaginalis, Mycoplasma hominis, M. genitalium, Ureaplasma urealyticum and U. parvum. Statistical analyses were used to compare bacterial prevalence and load between the three groups of women. Mycoplasma hominis and G. vaginalis co-infection was significantly more common in BV (60.7 %) compared to intermediate (36.4 %) and non-BV (8.8 %) Nugent scores (p < 0.001). Significantly higher loads of M. hominis (p = 0.001) and G. vaginalis (p < 0.001) were detected in women with BV and the respective loads in M. hominis and G. vaginalis co-infections displayed a significant positive correlation (p < 0.001; r = 0.60). No significant associations were seen with the other Mollicutes. The findings strengthen the evidence of a role for M. hominis in BV and a potential synergy with G. vaginalis. This synergy could be an important trigger of the condition and sexual contact the conduit for the transmission of an otherwise commensal bacterium that could initiate it.

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Acknowledgements

The authors would like to acknowledge the support of Randox Laboratories Ltd, who sponsored Ciara Cox and also thank Innovate UK for co-funding this study.

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Authors and Affiliations

  1. Regional Virus Laboratory, Belfast Health and Social Care Trust, Belfast, Northern Ireland, UK

    C. Cox, A. P. Watt, J. P. McKenna & P. V. Coyle

  2. Centre for Infection and Immunity, Queen’s University Belfast, Belfast, Northern Ireland, UK

    C. Cox

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Correspondence to C. Cox.

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Cox, C., Watt, A.P., McKenna, J.P. et al. Mycoplasma hominis and Gardnerella vaginalis display a significant synergistic relationship in bacterial vaginosis. Eur J Clin Microbiol Infect Dis 35, 481–487 (2016). https://doi.org/10.1007/s10096-015-2564-x

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  • DOI: https://doi.org/10.1007/s10096-015-2564-x

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