Unsafe sex is the main mode of HIV transmission.
D017954:Africa South of the Sahara / Q000453:epidemiology; D004866:Equipment Contamination; D005260:Female; D015658:HIV Infections / Q000453:epidemiology / Q000635:transmission*; D006801:Humans; D007267:Injections / Q000009:adverse effects; D008297:Male; D021841:Safe Sex