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Histopathological changes in different tissues after infection. (A) Histopathological changes in tracheas of different groups at 3 dpc. (B) Histopathological changes in kidneys of different groups at 3 dpc. (C) Histopathological changes in tracheas of different groups at 7 dpc. (D) Histopathological changes in kidneys of different groups at 7 dpc. Black arrow indicates lesions on trachea cilia. Yellow arrow indicates abnormal bleeding in the kidney. Scale bar = 50 μm.
