Data for the years 2021 & 2022 are preliminary. Due to the impact of the COVID-19 pandemic, data for the year 2020 should be interpreted with caution.
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, a 2020 edition of 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.

Methods | AHEAD

Data Methods & Resources

Learn more about Ending the HIV Epidemic in the U.S. by exploring the data methods.


Data and information gathered from AHEAD can be cited in the following manner, using the American Psychological Association (APA) format.

U.S. Health and Human Services. (2019, August 18). America’s HIV Epidemic Analysis Dashboard (AHEAD). Retrieved from

Data Methods

The HIV data presented on this site are from the National HIV Surveillance System (NHSS), managed by the Centers for Disease Control and Prevention (CDC). NHSS is the primary source for monitoring HIV trends in the United States. The CDC funds and assists state and local health departments to collect the information. States and local jurisdictions, including the District of Columbia and Puerto Rico, have laws or regulations that require confidential reporting by name for adults and adolescents. 


Learn more about the terminology used in the Ending the HIV Epidemic in the U.S. (EHE) initiative. Click on a term to view its definition.