title: AIDS: what is now known. II. Epidemiology.
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000453:epidemiology* / Q000209:etiology / Q000382:microbiology / Q000635:transmission; D000349:Africa; D002648:Child; D017977:Deltaretrovirus; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006467:Hemophilia A / Q000150:complications; D006556:Heroin Dependence / Q000150:complications; D006716:Homosexuality; D006801:Humans; D007223:Infant; D008297:Male; D009519:New York City; D011247:Pregnancy; D012306:Risk; D065227:Transfusion Reaction; D014481:United States