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This was not because black men had more unprotected sexual contacts. Unadjusted for other factors, men under 25 had a 31% higher per-contact risk of being infected, and black men had a 78% higher risk. Risk varied between studies, with the HIV risk in VAX004 72% higher and in EXPLORE 13% lower than in the VPS study. Researchers from the University of California, San Francisco, and the San Francisco Department of Public Health, used data from surveys of gay men that were conducted from 1992 to 2003 to find out if young men and black men had a higher per-contact risk of HIV infection that was not explained by other behavioural or demographic factors.Īveraged across studies, the risk for unprotected receptive sex with partners of unknown HIV status was one per 204 contacts – not much less risky than with known HIV-positive partners.
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This is not explained by individual risk behaviour: young gay black men actually have fewer partners and lower rates of recreational drug use than other gay men. Black people form 12% of the US population but have 45% of new HIV diagnoses and, while new HIV diagnoses stayed steady amongst most population groups in the last three years, they increased by 48% in young black gay men. Young men who have sex with men (MSM) and MSM of colour have the highest HIV incidence rates in the US. An analysis of four studies of sexual risk and HIV infection in US gay men, presented at the 20th Conference on Retroviruses and Opportunistic Infections (CROI 2013), has found a 22% higher risk of HIV infection per sexual contact in black gay men that is not explained by other factors such as number of sexual partners, injecting drug use or age.