Data Methods & Resources

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

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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.


Glossary of Terms Age and Age Groups: HIV surveillance data include adults and adolescents only (persons aged 13 years and older). These data are grouped into ten-year age groups. Age groups (rather than single year of age) are used to ensure data security and confidentiality. AIDS: “AIDS” stands for Acquired immunodeficiency syndrome. It is the most severe phase of HIV infection. People with HIV classified as stage 3 AIDS have such badly damaged immune systems that they get an increasing number of severe illnesses, called opportunistic illnesses.