Preventing the spread of AIDS.
D000163:Acquired Immunodeficiency Syndrome / Q000517:prevention & control* / Q000635:transmission; D003275:Contraceptive Devices, Male; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006678:HIV / Q000276:immunology; D006801:Humans; D008297:Male; D011247:Pregnancy; D012725:Sexual Behavior