California Update - very virulent Infectious Bursal Disease Virus (VVlBDV) in California

摘要

Infectious Bursal Disease (IBD), also known as Gumboro disease, is an acute, contagious, viral infection that causes subclinicalimmunosuppression in susceptible chickens three weeks of age or younger and clinical disease in susceptible older birds. IBD, characterized by inflammation and atrophy of the bursa of Fabricius, hemorrhages in skeletal muscle and increased mortality, isone of the major causes of economic loss in young chickens due to immunosuppression, morbidity and mortality. IBD virus (IBDV) is in the genus Avibirnavirus, family Birnaviridae, and consists of two double-stranded RNA segments designated A and B. SinceIBDV is endemic in the United States, vaccination is common practice for certain types of flocks.