HIV/AIDS: not one epidemic but many.
D000163:Acquired Immunodeficiency Syndrome / Q000453:epidemiology / Q000635:transmission; D017954:Africa South of the Sahara / Q000453:epidemiology; D001208:Asia / Q000453:epidemiology; D004196:Disease Outbreaks; D005060:Europe / Q000453:epidemiology; D015658:HIV Infections / Q000453:epidemiology* / Q000635:transmission; D006801:Humans