Data for the year 2021 are preliminary. Due to the impact of the COVID-19 pandemic, data for years 2020 and 2021 should be interpreted with caution. Visit coronavirus.gov for the latest Coronavirus Disease (COVID-19) updates.
COVID-19 disruptions in HIV, diagnosis, care and reporting of deaths during 2020 have also made incidence, prevalence, and knowledge of status estimates derived from a CD4-based model, unreliable. Therefore, the HIV surveillance supplemental report Estimated HIV Incidence and Prevalence in the U.S., which provides data on estimated incidence, prevalence, and knowledge of status in the U.S., was not published by CDC this year.

Provisional Data | AHEAD

Glossary

Learn more about the terminology used in the Ending the HIV Epidemic: A Plan for America initiative.

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Click on a term to view its definition.

Provisional Data

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.