The American Foundation For AIDS Research, Inc.

CLYMAX is a two-phase observational study that assess multiple aspects of chemsex and young men who have sex with men (YMSM).
Phase I of the study (CLYMAX,IRB No. 0695/65) was a cross-sectional descriptive study using a mixed methods data collection (focusing on qualitative data collection) assessing multiple aspects of chemsex, including the patterns of chemsex use and the perspectives on factors influencing chemsex initiation/discontinuation, effects on physical health, mental health and social outcomes, and the necessary services for a comprehensive chemsex clinic among YMSM; and the acceptability and feasibility of developing a comprehensive chemsex clinic from the perspective of YMSM, their family members or peers, and clinic staff.
This phase II study (CLYMAX-2) will be a prospective cohort study using a quantitative data collection exploring the effectiveness of the implementation strategy of harm reduction models and consist of a larger number of YMSM, important baseline and follow-up information on multiple aspects of physical, psychological, and social harms.

The study is a two-phase observational study that assess multiple aspects of study and young men who have sex with men (YMSM).
Phase I of the study will be a cross-sectional descriptive study using a mixed methods data collection (focusing on qualitative data collection) to acquire information necessary for developing a more extensive study on the same matter.
Phase II of the study will be a prospective cohort study using a quantitative data collection.
Findings from phase I will guide the development of phase II which consist of a larger number of YMSM, important baseline and follow-up questionnaires and comorbidities assessments, sexually transmitted infections testing, and integration to care.
This protocol exclusively addresses the phase I of the study.
Once the phase I findings are finalized, the principal investigator will submit the phase II to the IRB of the Faculty of Medicine, Chulalongkorn University.

This is a prospective observational cohort study that will enroll 300 HIV-negative transgender people and 150 transgender people living with HIV from 4 community health centers in Thailand, Vietnam, and the Philippines. Each participant will be followed-up until the completion of 24 months.