 We have studied HHR in New York City as part of the CDCs National HIV Behavioral Surveillance NHBS studies. Building on the NHBS work, we are currently in our third year of the main study R01DA032083, R: 11-01257, the primary aim of which is to compare the efficacy of a peer-driven intervention that uses a respondent-driven sampling strategy RDS-CTTN and venue-based sampling VBS with respect to identifying previously undiagnosed HIV infection. The main study is located in central Brooklyn, a high-risk area HRA with elevated rates of poverty, high heterosexual HIV prevalence, and where a generalized HIV epidemic may be said to exist. 