Fig. 6. Histopathological lesions observed in the respiratory tract of one of the affected animals from this study. Focal-extensive erosion and ulceration of the tracheal mucosa (large arrows) with thickening of the lamina propria (arrowheads) due to a mixed cell tracheitis and focal granuloma formation in animal WS3 (A). The inset shows a larger magnification of this granuloma, which consists of a necrotic core surrounded by few multinucleated giant cells (narrow arrows), macrophages, and heterophils. H&E staining. Partially degenerated parasitic structure within the lung parenchyma (dashed line) with multifocal acute hemorrhages (indented arrows) in the bronchi and parabronchi of animal WS3 (B). The inset shows a larger magnification of the degenerated parasite with surrounding granulomatous inflammation, composed of abundant multinuclear giant cells (narrow arrows), macrophages, heterophils and acute hemorrhage. H&E staining.

Published as part of Meister, Seraina L., Wenker, Christian, Wyss, Fabia, Zühlke, Irene, In, Veiga, es Berenguer & Basso, Walter U., 2022, Syngamus trachea in free-ranging white stork (Ciconia ciconia) nestlings in Switzerland, pp. 76-81 in International Journal for Parasitology: Parasites and Wildlife 18 on page 80, DOI: 10.1016/j.ijppaw.2022.04.007, http://zenodo.org/record/13288231