Abstract

A virus (PDV-1 isolate) isolated from livers of a cockatoo with Pacheco's parrot disease (PPD) possessed the morphological, biological, and physicochemical properties of a Group-A herpesvirus. Virus-neutralization tests showed the isolate to be antigenically similar or identical to another herpesvirus isolate from PPD. The herpesvirus (PDV-1) inoculated to budgerigars caused a fatal disease with pathologic lesions similar to those of PPD, and the same herpesvirus was reisolated from the inoculated birds. The PDV-1 isolate grew readily in chick and duck embryo fibroblasts but poorly in chick embryo kidney cell cultures, with cytopathic effects typical of a herpesvirus. High yields of infectious virus in the culture fluids of infected cell cultures indicated that the virus infectivity was not cell-associated.

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