Human plague in 1990.
D000349:Africa / Q000453:epidemiology; D001208:Asia / Q000453:epidemiology; D005060:Europe / Q000453:epidemiology; D006801:Humans; D010930:Plague / Q000453:epidemiology*; D013020:South America / Q000453:epidemiology; D014481:United States / Q000453:epidemiology