Rerkasem A, Chotirosniramit N, Saokhieo P, et al. - Researchers conducted a cross-sectional study on men who have sex with men (MSM) for the HIV prevention project with the aim to determine the prevalence of HIV infection–related behaviors among 551 MSM recruited in 2008–2009 and 1,910 MSM in 2014–2018 for voluntary counseling and testing at a HIV clinic in Chiang Mai. Findings revealed a significant decrease in the prevalence of HIV infection from 12.9% (71/551) in the earlier study (2008–2009) to 8.2% (157/1,910) in the recent study (2014–2018). Exploratory multivariate analysis revealed following factors to be linked with HIV infection: gay men, age below 20 years, being self-employed, being an employee, having only receptive anal sex, having both receptive/insertive anal sex, being a former substance user, using online dating, having a history of sexually transmitted infection symptoms, self-perception as being at high risk for HIV, last HIV testing > 1 year, and never previously testing for HIV. The data overall suggest the trend of health-seeking behavior improvements.