Influenza in the world. 1 October 1993-30 September 1994.
D000349:Africa / Q000453:epidemiology; D000569:Americas / Q000453:epidemiology; D001208:Asia / Q000453:epidemiology; D005060:Europe / Q000453:epidemiology; D006801:Humans; D007251:Influenza, Human / Q000453:epidemiology* / Q000821:virology; D011159:Population Surveillance