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Kidney histopathology in infected broiler chickens. Normal kidney (A), congestion, severe degeneration and necrosis, and interstitial nephritis in variant IBV (B), Massive infiltration of leucocytes blood vessel congestion in AIV-H9N2 and classical IBV (C), severe degenerative changes and hemorrhages in AIV-H9N2 and variant IBV (D), and in AIV-H9N2 and IBV vaccine (E). Magnification 10 × and scale bar = 100 μM.
