Epidemiology.
D018562:Disease Transmission, Infectious / Q000706:statistics & numerical data*; D005260:Female; D015658:HIV Infections / Q000453:epidemiology* / Q000635:transmission; D018452:Homosexuality, Female / Q000706:statistics & numerical data*; D006801:Humans; D012307:Risk Factors; D014481:United States / Q000453:epidemiology