Inclusion body disease of falcons (IBDF) is caused by a herpesvirus. The clinical course is short, 24 to 72 hours in duration, and is characterized by mild to severe depression and weakness often accompanied by anorexia. The disease is invariably fatal. The virus has a marked affinity for the reticuloendothelial system and hepatocytes, producing focal to diffuse necrosis of infected tissues accompanied by the formation of intranuclear inclusion bodies. The virus is pathogenic for American kestrels (Falco sparverius) and great horned owls (Bubo virginianus) in which typical lesions of IBDF are reproduced. The lesions of IBDF are similar to those produced by some herpesvirus infections in other avian species.
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Vol. 11 • No. 1