title: Continuing vigilance needed on HIV.
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000453:epidemiology / Q000209:etiology*; D005500:Follow-Up Studies; D006679:HIV Seropositivity / Q000150:complications*; D006801:Humans; D008297:Male; D012495:San Francisco / Q000453:epidemiology