Participants in Group A will be invited to come to the Thai Red Cross Anonymous Clinic, RSAT or SWING drop-in centers in Bangkok, or SWING or Sisters drop-in centers in Pattaya. After registration, they will receive standard HIV Testing and Counseling (HTC) services.

participants will be guided to access services at the 'Adam's Love Offline Clinic,' a clinic set up specifically to provide private and fast HIV testing and post-test counseling only.

participants will be mailed a rapid HIV test kit. A trained online counselor will guide the participant through an online HIV testing process which includes quality checking of the test kit, obtaining blood through finger prick, performing the testing steps, and reading the test result.

Offline or online referral to HIV treatment facility HIV-positive participants can choose to receive either an offline or online referral to HIV treatment facilities. An offline referral method usually includes a referral letter and/or a telephone call, followed by a series of calls to participants to ensure successful referral. Those who choose an online referral will be able to register online with an HIV treatment facility which provides ART without cost under the national programs. Participants will receive a registration code which will allow them to access HIV treatment clinics directly without the need to go through the regular registration and appointment system at that facility.

The first-time HIV testers, successful HIV tests completed and successful referral to HIV treatment are the categorical data which don't have the units to measure. These variables are the binary outcome in which there are only two possible status e.g. yes or no, therapeutic successes or failure. The details are as follows:

• The first-time HIV testers: this outcome variable is collected from the questionnaire; the probability of the outcome is likely to be "yes" or "no".
• Successful HIV tests completed: this outcome variable is collected form the result of the laboratory; the probability of the outcome is likely to be "complete" or "incomplete".
• Successful referral to HIV treatment: this outcome variable is collected form the confirmation of antiretroviral treatment; the probability of the outcome is likely to be "successful" or "failure".

Therefore frequency and proportions of participants who have the possible outcome that we are interested (who are the first HIV testers, who

The proportion of HIV-positive participants who have virological suppression at each study visit after initiating ART among MSM and TG who access online vs. offline services will be reported together with 95% confidence intervals. Formal comparisons between groups will be made using a Chi-squared test.