title: [AIDS: extent of the problem].
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000453:epidemiology* / Q000635:transmission; D000328:Adult; D001782:Blood Donors; D004797:Enzyme-Linked Immunosorbent Assay; D006679:HIV Seropositivity; D006716:Homosexuality; D006801:Humans; D008297:Male; D008875:Middle Aged
vernacular_title: SIDA: magnitud del problema.