Histological and ultrastructural characterisation of hepatic intranuclear inclusion bodies in psittacine birds and pigeons

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Abstract
Intranuclear inclusion bodies (IIB) in hepatic cells were seen in nine pigeons and eight psittacine birds within a period of 6 years. Electron microscopically they were found to be associated with adenovirus infection (two psittacines and three pigeons), simultaneous adenovirus‐parvovirus infection (two pigeons), herpesvirus infection (four psittacines and four pigeons) or filamentous structures (two psittacines). In psittacines it was possible to differentiate by light microscopy between IIB due to adenovirus, herpesvirus and filaments. In pigeons, adenovirus and herpesvirus produced IIB of similar appearance. However, criteria could be found to distinguish between them histologically. On the other hand, parvovirus‐infected nuclei were not histologically distinguishable from adenovirus‐infected nuclei.

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