title: Researchers seek clues to long-term survival.
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000276:immunology / Q000401:mortality*; D002648:Child; D018450:Disease Progression; D005260:Female; D006678:HIV / Q000302:isolation & purification; D015658:HIV Infections / Q000097:blood / Q000635:transmission; D006679:HIV Seropositivity / Q000276:immunology / Q000401:mortality*; D018451:Homosexuality, Male; D006801:Humans; D008297:Male; D016019:Survival Analysis; D017741:Survivors / Q000706:statistics & numerical data; D013997:Time Factors