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A new study strengthens growing evidence that Mycoplasma genitalium (MG) is a sexually transmitted infection (STI). The findings are recently published in the International Journal of Epidemiology.
Analyses of more than 4,500 of urine samples from Britain’s third National Survey of Sexual Attitudes and Lifestyles (Natsal-3) showed that MG was prevalent in up to 1% of the general population aged 16-44, who had reported at least one sexual partner. Prevalence was much higher in those who had reported more than four sexual partners in the past year – 5.2 percent in men and 3.1 percent in women. Absence of the infection in more than 200 16-17 year-olds who had not had vaginal, anal, or oral sex provided further evidence that MG is transmitted sexually.
More than 90 percent of MG in men and more than two-thirds of MG cases in women were in those aged 25-44 years; an age group who would not be included in STI prevention measures currently aimed at young people in Britain.
The study also analysed risk factors for MG, such as ethnicity, number of partners, and areas of deprivation. There were strong associations with risky sexual behaviours, with similar behavioural risk factors to other known STIs. The authors found that men of Black ethnicity and those living in the most deprived areas were more likely to test positive for MG.
Interestingly, the majority of participants who tested positive for MG did not report any STI symptoms in the last month. Over half of women did not report any symptoms, but among those who did, bleeding after sex was most common. More than 90 percent of MG positive men did not report any symptoms. Dr. Pam Sonnenberg, lead author of the paper comments, “These findings suggest that only testing those who are currently symptomatic would miss the majority of infections. However, further research is needed to understand the clinical implications of infection and possible longer-term complications. This information, together with information on resistance patterns to guide antibiotic choice, will inform recommendations on how to test for and manage MG infection.”
Reference: Epidemiology of Mycoplasma genitalium in British men and women aged 16-44 years: evidence from the third National Survey of Sexual Attitudes and Lifestyles’, Pam Sonnenberg, Catherine A. Ison, Soazig Clifton, Nigel Field, Clare anton, Kate Soldan, Simon Beddows, Sarah Alexander, Rumena Khanom, Pamela Saunders, Andrew J. Copas, Kaye Wellings, Catherine H. Mercer and Anne M. Johnson.
International Journal of Epidemiology, doi: 10.1093/ije/dyv194
Source: Oxford University Press