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Photomicrographs chicken liver sections stained with hematoxylin and eosin. A) normal liver histological structure of non-challenge (NC) group (400X); B) 1. Inflammatory cell infiltration (circle) and 2. Presence of vacuolization (arrow) in liver of an individual from the Challenged group (CH) (400X). These changes contributed to the highest (P< 0.05) ISI index in Eimeria sp. challenge group at 21 days of age.
