HIV: the more things change, the more they stay the same.
D000163:Acquired Immunodeficiency Syndrome / Q000453:epidemiology / Q000635:transmission*; D015497:HIV-1 / Q000145:classification / Q000302:isolation & purification*; D015498:HIV-2 / Q000302:isolation & purification; D006801:Humans; D012725:Sexual Behavior; D013785:Thailand / Q000453:epidemiology; D014481:United States / Q000453:epidemiology