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Immunohistochemistry of an HPAI H5N1–infected white Cherry Valley duck (Anas platyrhynchos). The viral antigen is detected in myocardial cells and lymphoid cells (arrow) (A) and renal tubular cells (B) (magnification ×100). The primary antibody used for immunohistochemistry in this study was a mouse anti–avian influenza H5 antibody (Magellan Biotechnology, Chunan, Taiwan).
