This classification system is how the United States agency, the Centers for Disease Control and Prevention <unk>  classifies HIV disease and infection. This is to allow the government to handle epidemic statistics and define who receives US government assistance. In 1993, the<unk>  added pulmonary tuberculosis, recurrent pneumonia, and invasive cervical cancer to the list of clinical conditions in the AIDS surveillance case definition published in 1987 and expanded the AIDS surveillance case definition to include all HIV-infected persons with CD4+ T-lymphocyte counts of less than 200 cells/uL or a CD4+ percentage of less than 14. Considerable variation exists in the relative risk of death following different AIDS defining clinical conditions.
CDC Classification System for HIV Infection in Adults and Adolescents
CDC Classification System for HIV Infection in Children
HIV AIDS epidemiology and demographics
HIV AIDS classification
HIV AIDS diagnostic study of choice
HIV AIDS screening
Neurosyphilis Epidemiology and Demographics
HIV AIDS cost-effectiveness of therapy