Sex Transm Infect 86:21-24 doi:10.1136/sti.2009.038190
  • Epidemiology

The prevalence of urethral and rectal Mycoplasma genitalium and its associations in men who have sex with men attending a genitourinary medicine clinic

  1. C Ison2
  1. 1Department of Genitourinary Medicine, Brighton and Sussex University Hospitals NHS Trust, Sussex, UK
  2. 2Sexually Transmitted Bacteria Reference Laboratory Centre for Infections, Health Protection Agency, Colindale, London, UK
  1. Correspondence toDr Suneeta Soni, Lydia Clinic, Department of Genitourinary Medicine, St Thomas' Hospital, Lambeth Palace Road, London SE1 7EH, UK; suneeta.soni{at}
  1. Contributors SS: principle investigator. Design of study, data collection, primary analysis, author of first and final draft of paper: SA: design of study, laboratory supervisor, amendments to paper: NV: statistical analysis, amendments to paper: PS: assistant laboratory supervisor laboratory: DR: design of study, amendments to paper: MF: design of study, amendments to paper: CI.

  • Accepted 16 August 2009
  • Published Online First 19 October 2009


Objectives To determine the prevalence of rectal and urethral Mycoplasma genitalium (MG) in men who have sex with men (MSM) attending a genitourinary medicine clinic and to measure its associations with symptoms, clinical signs, sexual behaviour and concomitant sexually transmitted infections (STI).

Methods MSM attending for STI screening were tested for MG using a real-time PCR assay that targets the MgPa gene. Data were collected on demographics, sexual behaviour, past STI history and clinical symptoms and signs.

Results 849 first-void urine and rectal specimens were collected from 438 MSM. The overall prevalence of MG in MSM was 6.6% with first-void urine positivity of 2.7% and rectal positivity of 4.4%. MG was significantly associated with HIV positivity (OR 7.6, 95% CI 3.2 to 18.7, p<0.001) in contrast to Chlamydia trachomatis (OR 1.5, 95% CI 0.5 to 4.1, p=0.4) and Neisseria gonorrhoeae (OR 1.7, 95% CI 0.7 to 3.8, p=0.194). MG was more prevalent than C trachomatis (p=0.15) and N gonorrhoeae (p=0.02) in this subgroup of HIV-positive MSM. Urethral infection was associated with dysuria (p<0.001) but there was no association between rectal infection and anorectal symptoms or signs.

Conclusion Rates of MG are much higher in HIV-positive MSM than HIV-negative MSM at both urethral and rectal sites, and MG is more prevalent in HIV-positive MSM than other bacterial STI. Although the subclinical nature of MG in the rectum questions its significance, the high prevalence seen at this site could be a potential source of onward urethral transmission. Future work should assess the need for appropriate screening and treatment of MG infection in MSM, particularly those with HIV infection and high-risk sexual behaviour.


  • Funding This study was undertaken as a BASHH/HPA fellowship.

  • Competing interests None.

  • Ethics approval This study was approved by Brighton East Research Ethics Committee.

  • Patient consent Obtained.

  • Provenance and peer review Not commissioned; externally peer reviewed.