MeSH definition : A species of AVIBIRNAVIRUS causing severe inflammation of the bursa of Fabricius in
chickens and other fowl. Transmission is thought to be through contaminated feed or
water. Vaccines have been used with varying degrees of success.;
A species of AVIBIRNAVIRUS causing severe inflammation of the bursa of Fabricius in
chickens and other fowl. Transmission is thought to be through contaminated feed or
water. Vaccines have been used with varying degrees of success.