Avian influenza.
D000818:Animals; D001717:Birds; D004196:Disease Outbreaks; D006801:Humans; D009980:Influenza A virus / Q000145:classification* / Q000472:pathogenicity*; D005585:Influenza in Birds / Q000635:transmission*; D007251:Influenza, Human / Q000175:diagnosis* / Q000628:therapy*; D014944:World Health Organization