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| 5) Enlargement (swelling) of the kidney having petechiae (Case Nos.3 and 5), and decoloration (No.4). | 6) Retained growth of chicken embryos seen at hatching eggs infected with infectious bronchitis virus (right). |
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| 7) Degeneration of epithelial cells of tracheal mucosa and cell infiltration at proper stratum of mucous membrane of the trachea. | 8) Degeneration of epithelial cells of renal tubules and intestinal cell infiltration in the kidney. |
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