Acquired immunodeficiency syndrome (AIDS)--data as at 31 January 1991.
D000163:Acquired Immunodeficiency Syndrome / Q000453:epidemiology*; D000349:Africa / Q000453:epidemiology; D000569:Americas / Q000453:epidemiology; D001208:Asia / Q000453:epidemiology; D005060:Europe / Q000453:epidemiology; D006801:Humans; D010139:Pacific Islands / Q000453:epidemiology