title: AIDS in the "gay" areas of San Francisco.
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000453:epidemiology* / Q000635:transmission; D000293:Adolescent; D000328:Adult; D002140:California; D004196:Disease Outbreaks / Q000453:epidemiology; D006716:Homosexuality; D006801:Humans; D008297:Male; D008875:Middle Aged