title: AIDS aetiology and HIV-1.
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000150:complications / Q000209:etiology* / Q000382:microbiology*; D015497:HIV-1; D006716:Homosexuality; D006801:Humans; D008297:Male; D012309:Risk-Taking; D019966:Substance-Related Disorders