Heterosexual transmission of HIV.
D000163:Acquired Immunodeficiency Syndrome / Q000453:epidemiology / Q000517:prevention & control / Q000635:transmission*; D000349:Africa; D004812:Epidemiologic Methods; D005060:Europe; D005260:Female; D006801:Humans; D008297:Male; D009656:North America; D012307:Risk Factors; D012725:Sexual Behavior