[[File:Gumboro.jpg|thumb|200px|right|Bursa of Fabricius in acute disease, 5 days after infection and 8 days post infection (left to right). Source - Intervet at [http://www.gumboro.com/]]
Infectious bursal disease is a '''highly contagious [[Viruses | viral]]''' disease of birds caused by an avibirnavirus.
Infectious bursal disease is a '''highly contagious [[Viruses | viral]]''' disease of birds caused by an avibirnavirus.