Inclusion Criteria:• Men who had sex with another man in the last 12 months based on self-reporting (sex can be defined as oral, anal, or mutual masturbation)(including transgendered women)(including transgendered women);
- Aged 18 years or older;
- Living and/or working in the defined districts of municipal Beijing;
- Able and willing to adequately grant informed consent. For the purposes of this activity participants must consent to questionnaire surveys, receipt of phone messages, and serological testing;
- Having not previously participated in HIV testing in this study.
Besides these criteria, additional criteria for the HIV Linkage and Care pilot Research Clinical Trial are:
- Men who are being identified as HIV positive during the testing campaign in Phase I of the study;
- No plan to leave Beijing in the next 12 months.
- Willing to comply with study procedures.
- Having a cell phone and willing to receive study related SMS texts
Exclusion Criteria:
Having previously been found to be HIV positive based on self-reporting during eligibility screening;
- Serious psychological disturbance or cognitive impairment interfering with the participant's ability to comply with the study visit schedule and procedures, as judged by the local study clinician;
- Any other medical or psychiatric condition that, in the opinion of the investigator, would make participation in the study unsafe, or otherwise interfere substantially with the study objectives or interpretation.