Inclusion body hepatitis (IBH) was diagnosed in a flock of 12-day- old, meat type chickens. Six live and 4 dead birds were submitted to the TVMDL-Center Lab with a history of increased mortality, swollen kidneys, and whitish spots livers. At the necropsy examination livers were pale, mottled with a reticular pattern and with subcapsular hemorrhages; heart sacs had accumulation of a clear fluid in the pericardium; bursas of Fabricius were atrophied; kidneys were swollen and pale; and in pancreases there were pale pin-point spots. The histopathological examination of liver and pancreas sections revealed multifocal to coalescent areas of necrosis associated with mixed inflammatory cell infiltration and large, basophilic intranuclear inclusions, which are characteristic of IBH. IBH is caused by Group I avian adenoviruses, which are transmitted vertically and horizontally. IBH in chickens is commonly associated with immunosuppression.
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