Influenza.
D005060:Europe / Q000453:epidemiology; D006801:Humans; D009980:Influenza A virus / Q000145:classification / Q000302:isolation & purification; D009981:Influenza B virus / Q000302:isolation & purification; D007251:Influenza, Human / Q000453:epidemiology* / Q000821:virology; D007557:Israel / Q000453:epidemiology; D012703:Serotyping; D014481:United States / Q000453:epidemiology