Infectious bursal disease (IBDV) is caused by a birnavirus. The virus is resistant to many disinfectants and environmental factors, and remains infectious for at least four months in the poultry house environment. Infectious bursal disease is highly contagious; the severity of the disease will depend on the age and breed of chicken and the virulence of the virus. White Leghorns are more susceptible than broilers and brown-egg layers.
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