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. 2022 Oct 27;102(1):102250. doi: 10.1016/j.psj.2022.102250

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© 2022 The Authors

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Histological lesions of respiratory tract samples from the BJ17-inoculated SPF chickens. (A) Trachea section from a non-inoculated chicken shows intact ciliated epithelium. (B) Trachea section of a BJ17-inoculated chicken displaying loss of cilia, rupture of architenture, and infiltrated inflammatory cells in the epithelium and submucosa. (C) Lung section from a non-inoculated chicken shows no overt inflammation. (D) Lung section of a BJ17-inoculated chicken displaying infiltration of inflammatory cells, such as lymphocytes, disffused heterophils and macrophages in the lung. Bars, 20 μm.