Virus reaches U.S.
D000349:Africa / Q000453:epidemiology; D001782:Blood Donors; D005260:Female; D015658:HIV Infections / Q000453:epidemiology* / Q000382:microbiology / Q000635:transmission; D015498:HIV-2 / Q000302:isolation & purification*; D006801:Humans; D008297:Male; D012747:Sexual Partners; D014481:United States / Q000453:epidemiology