MSM

Higher HIV testing rates and safer sex may explain why HIV incidence is falling among San Francisco men who have sex with men (MSM) but rising in London MSM, and why undiagnosed HIV rates are dropping in San Francisco but not in London [1]. Results of this extensive data analysis suggest that HIV testing, awareness, and condom use trump linkage to care and retention in care in HIV prevention. Colin Brown (Public Health England) and colleagues in London in San Francisco observed that HIV infection is endemic in San Francisco (24 % of 64,000 MSM) and London (9 % of 234,000 MSM) and that similar numbers of MSM have an HIV diagnosis (13,000 and 14,000). But MSM epidemics in the two gay meccas differ in important ways: Estimated undiagnosed HIV infections are down in San Francisco since 2006 (from 21.7 % to 7.5%) but static in London (around 20 % to 25%). And HIV incidence (the new-infection rate) has dwindle