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EN
Proventricular dilatation disease (PDD) is a fatal disorder that has been described in psittacine birds for a longer time, but bornavirus as the cause of that disease was only recognized recently. PDD is characterized by lymphoplasmacytic infiltration of the ganglia of the central and peripheral nervous system, leading to central nervous system disorders as well as motility of the gastrointestinal tract and associated degeneration. New research has revealed that bornavirus infection also occurs in other bird species, including the canary (Serinus canaria). Clinical and histopathological signs are similar in canaries as in psittacine birds, but regurgitation and whole seeds in feces were not observed in the presented causes as described by others. The three cases of canary bornavirus infection originate from different flocks in different parts of Poland; thus probably also in our country the virus can be widely distributed.
EN
Polyomavirus was diagnosed in a canary (Serinus canaria) colony with signs of debilitation and mortality among young (mostly six-weeks-old) and adult birds, which rarely survived longer than two years. The main pathological changes in necropsied canaries were splenomegaly, hepatomegaly, and kidney swelling. Microscopically, intranuclear inclusion bodies were observed in the liver and kidneys. Necrotic and inflammatory changes were also present in these organs. Less susceptibility was observed in red and black glosters, and in agate canaries. Concurrent infections, such as mycobacteriosis, coccidiosis, atoxoplasma, and bornavirus, were detected in individual birds. Diagnosis was confirmed by a nested PCR test. Polyomavirus appears to have been the primary etiological agent of the disease and immunosuppression.
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