The Changing Burden of HIV Attributable to Methamphetamine Among Men Who Have Sex with Men in King County, Washington.

Methamphetamine use is a key driver of HIV transmission among men who have sex with men (MSM). We evaluated trends in incident HIV diagnosis rates among methamphetamine using and nonusing MSM and assessed the relationship between methamphetamine use and demographic, behavioral, and clinical characteristics among MSM newly diagnosed with HIV. We analyzed several sources of HIV and behavioral surveillance data to estimate incident rates of HIV diagnoses and the population attributable risk percent corresponding to methamphetamine use among MSM in King County, Washington. Missing values were recovered through multiple imputation. We report descriptive statistics and adjusted odds ratios yielded from multivariable logistic regression models. Between 2010 and 2015, the HIV diagnosis rate among methamphetamine-using MSM declined from 31.2 to 11.5 per 1000 MSM (vs. 6.4-3.9 per 1000 MSM overall), and the percent of new diagnoses attributable to methamphetamine use declined from 25% to 13%. During the same period, methamphetamine use among HIV-negative MSM remained relatively stable. Among MSM newly diagnosed with HIV, methamphetamine-using MSM were more likely to be unstably housed (24% vs. 6%), to have engaged in transactional sex (19% vs. 4%), and to have had female partners (17% vs. 10%). Methamphetamine-using MSM were less likely to be virally suppressed at 6 (31% vs. 54%) and 12 (59% vs. 73%) months following an HIV diagnosis. The declining HIV diagnosis rate among methamphetamine-using MSM is encouraging, but this subgroup continues to have considerable HIV risk and health disparities.