Learn more about the terminology used in the Ending the HIV Epidemic: A Plan for America initiative.
Click on a term to view its definition.
Provisional data are data that have at least 12 months of reporting delay and applies only to annual data. For example, 2018 annual data using a December 2019 dataset are provisional.
Studies have shown that PrEP reduces the risk of getting HIV from sex by about 99% when taken daily. Among people who inject drugs, PrEP reduces the risk of getting HIV by at least 74% when taken daily.