CDC revises AIDS definition.
D015704:CD4 Antigens / Q000032:analysis; D002487:Centers for Disease Control and Prevention, U.S.; D015658:HIV Infections / Q000145:classification* / Q000276:immunology; D015497:HIV-1; D006801:Humans; D007108:Immune Tolerance; D013601:T-Lymphocytes / Q000276:immunology; D014481:United States
D015704:CD4 Antigens