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Lesions and immunohistochemistry after bovine coronavirus (BoCV) strain OK 1776 infection. A. Interstitial pneumonia characterized by increased cellularity of alveolar septa and increased macrophages in alveoli. 200×. H&E. Bar = 20 µm. B. Anti-BoCV immunohistochemistry demonstrating positive BoCV signal in tracheal gland epithelium. 400×. Bar = 20 µm.
