AIDS surveillance definition expanded.
D000163:Acquired Immunodeficiency Syndrome / Q000097:blood / Q000150:complications / Q000453:epidemiology*; D015496:CD4-Positive T-Lymphocytes; D002487:Centers for Disease Control and Prevention, U.S.; D006801:Humans; D007958:Leukocyte Count; D011159:Population Surveillance; D014481:United States