Fig. 1

Morphological characterization of Ascaris suum nematode infection in the lung of a dog in China, 2019. a Multiple transverse sections of A. suum larvae observed in lung tissues with severe, hemorrhagic, fibrinous interstitial pneumonia. b The morphological characteristics of the larvae included maximum diameter of 68 μm, thin cuticle (Cu), a centrally located intestine (In), paired lateral alae (Al) and excretory columns (EC). Some scattered macrophages, lymphocytes and eosinophils are also indicated. Hematoxylin and eosin stain. Scale-bars: 100 µm