The primary goal of this project is to model the effect of different levels of PrEP coverage across strata of age, race, and geography. Risk screening tools have been found to perform deferentially by race, resulting in under-identification of black MSM with indications for PrEP. We propose to examine different scenarios of PrEP coverage in high-risk groups (e.g., offering PrEP to all black MSM under age 30) to assess the overall impact on HIV incidence at a national level.