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Syphilis transmission higher among transgender women, gay and bisexual men of color – study

Transgender women, and gay and bisexual men of color are nearly twice as likely to contract syphilis at some point in their lives as white gay men.

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Transgender women, and gay and bisexual men of color are nearly twice as likely to contract syphilis at some point in their lives as white gay men.

This is according to a study – “Syphilis prevalence, incidence, and demographic differences in a longitudinal study of young sexual and gender minority adults assigned male at birth” by Casey D Xavier Hall, Daniel Ryan, Christina Hayford, Ethan Morgan, Irina Tabidze, Richard D’Aquila, and Brian Mustanski – that appeared in The Journal of Infectious Diseases.

This research comes as the Centers for Disease Control and Prevention (CDC) in the US plan to recommend doxy-PEP, a one-time dose of the antibiotic doxycycline, for use after an unprotected sexual encounter, to gay and bisexual men and trans women. The treatment could help curb cases of syphilis, gonorrhea and chlamydia.

At least in the US (including in Chicago, the focus of this study), syphilis cases have increased over the past several years, with most new cases occurring among gay and bisexual men. In addition to causing serious health consequences when it is not detected or treated, syphilis is linked to an increased risk of HIV transmission.

Rather than studying only gay men, as with many HIV/STI studies in the past, the study also included gender-diverse individuals from groups often overlooked by prospective research.

“In our sample, transgender populations were the most likely to have a lifetime syphilis diagnosis, but they are rarely included in public health surveillance in a way that allows us to compare to other groups,” said Mustanski, the study’s lead author. “Our findings suggest that preventing and treating syphilis requires outreach to this key population.”

A quarter of participants had syphilis at some point in their lifetime and the authors estimate every year 6.7% of them will get a new infection. Forty-five percent of transgender participants had lifetime incidences of syphilis in addition to 42% of Black participants.

Mustanski explained: “My prior research on racial disparities in HIV has shown that they are not attributable to group differences in risk behaviors, but instead are due to social and structural factors such as denser sexual networks and less access to testing and treatment of STIs. Future research should examine if these are the same drivers of disparities in syphilis, and if so, how we can create structural changes that promote greater health equity.”

Prospective studies, which track study participants over time, allow scientists to estimate incidence of syphilis. This was among the first US-based prospective study cohort of racially diverse young sexual and gender minorities to observe cases over time and examine risk factors. The study used data from part of a larger study, the Institute’s RADAR study, that incorporated social media and social networks to recruit a range of participants.

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“Nationally about half of all syphilis infections are among gay and bisexual men,” Mustanski said. “Beyond this worrying statistic, half of syphilis cases among these men occur in men living with HIV. Men who test HIV-negative who are diagnosed with syphilis then have an increased risk of getting HIV because syphilis facilitates HIV transmission. Chicago needs more syphilis prevention efforts to address current transmission rates and curb a potential syphilis epidemic.”


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