Infectious Bursal Diseases signs
The disease affects immature chickens world wide. Acute infection with classic mild or variant strains results in up to 5% mortality. The variants are more immunosuppressive than the classic strains. Very virulent (vvIBD) virus may kill up to 50% of susceptible flocks.
Avibirnaviruses are immunosuppressive and predispose flocks to intercurrent viral pathogens and secondary bacterial infection.
Infectious Bursal Disease is a major restraint to productivity and profitability in the poultry industries of both industrialized and developing nations.
