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Immunohistochemical labeling of Usutu virus antigens in experimentally infected canaries using a mix of 4E9 and 4G2 anti-E protein monoclonal antibodies. Red-brown staining in antigen-positive cells from the heart (a), lung (b), lachrymal gland (c), and small intestine (d). Mayer hematoxylin counterstain, Scale bars: 10 µm.
