Elevated HIV and STI Prevalence and Incidence Among Methamphetamine-Using Men Who Have Sex With Men in Los Angeles County.

Methamphetamine use is associated with increased HIV/STI infection among men who have sex with men (MSM). From March 2014 through January 2016, 286 methamphetamine-using MSM enrolled in a study to reduce methamphetamine use and sexual risk behaviors. Participants were tested for HIV/STIs at baseline and every 3 months for 9 months. At baseline, 115 participants (40.2%) were HIV-positive; three participants seroconverted (incidence = 2.6/100 person-years). Baseline testing diagnosed 77 STI cases (21 chlamydia, 18 gonorrhea, 38 syphilis); by 9-month follow-up, 71 incident STIs were diagnosed (22 chlamydia, 24 gonorrhea, 25 syphilis); 78% occurred among HIV-positive participants. Despite efforts to reduce sexual risks among methamphetamine-using MSM, HIV/STI prevalence and incidence remain elevated.