Pre-ejaculatory fluid risk for HIV spread.
D015658:HIV Infections / Q000453:epidemiology / Q000635:transmission*; D006679:HIV Seropositivity; D006801:Humans; D007962:Leukocytes / Q000166:cytology*; D008214:Lymphocytes / Q000276:immunology; D008297:Male; D012307:Risk Factors; D012661:Semen / Q000166:cytology* / Q000276:immunology