Fig. 5 in Large lungworms (Nematoda: Dictyocaulidae) recovered from the European bison may represent a new nematode subspecies

Fig. 5. Histopathological lesions in the lungs of European bison infected with Dictyocaulus viviparus. (A) The cross-section of a nematode in the lumen of bronchiole (arrow); mononuclear cells infiltration in the mucous membrane of the bronchiole. H-E stain (× 40 magnification). (B) Multiple cross-sections of nematodes scattered within alveoli and bronchiole (arrows). H-E stain (× 40 magnification). (C) Interstitial pneumonia, diffuse, lymphoplasmacytic, eosinophilic with the hyperplasia of the vascular wall (arrows). H-E stain (× 40 magnification). Inset: Perivascular, peribronchiolar lymphocytic and eosinophilic infiltration; on the left side: the tunica media of vessels is thickened (hyperplastic). H-E stain (× 200 magnification). (D) Prominent peribronchiolar hyperplasia of the lymphoid follicle (arrow); pulmonary tissue showed interstitial pneumonia pattern. H-E stain (× 200 magnification).