Gumboro disease or infectious bursal disease (IBD) is caused by a small virus classified as belonging to the family birnaviridae. It was first described in 1962 in the USA by Cosgrove and it has caused huge economic problems to the poultry industry worldwide. More recently, in the late 80s, a more pathogenic IBD virus, called very virulent IBDV (wlBDV) was identified and it readily spread to almost all producing areas in the world. Asia was hit by this virus in the beginning of the 90s and, since then, economic problems related to high mortality and poor zootechnical performance have been seen throughout the continent. There are two serotypes of IBDV.
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