Fig. 4.

Hematoxylin and eosin (HE)-stained tissue sections. L Basophilic inclusion bodies in hepatocytes with severe lymphocyte infiltration and fatty degeneration. M Lymphocytes reduced and macrophages gathered in the spleen. N Bronchioles structures obliterated, blood stasis and dilation in lung capillaries. Q Degeneration and structure disturbance in the pancreas. R Abruption of intestinal villus in the intestine. S Exfoliated epithelial cells in the proventriculus. T necrotic and exfoliated epithelial cells in the gizzard. A–J A control chicken at 4 dpi. K–T A FAdV-8a-challenged chicken at 4 dpi.