The transmission of AIDS.
D000163:Acquired Immunodeficiency Syndrome / Q000635:transmission*; D005260:Female; D006801:Humans; D007157:Immunologic Surveillance; D008297:Male; D012007:Rectum / Q000276:immunology; D012661:Semen / Q000276:immunology; D014621:Vagina / Q000276:immunology