Data are based on the CDC adult HIV/AIDS confidential case report, Form 50.42A, Rev. 3/2007, and extended back-calculation methods.
The HIV case definition used by the HIV Surveillance system is provided by CDC. Data are adjusted for reporting delays. National HIV prevalence and the proportion of persons who are aware of their infection is estimated through extended back-calculation.
Estimates were derived by using extended back-calculation on HIV and AIDS data for persons aged 13 years and older at diagnosis from 46 states that have had confidential name-based HIV infection reporting since at least January 2007 and on AIDS data from 5 areas (Hawaii, Maryland, Massachusetts, Vermont, and the District of Columbia).