Fig. 1

Gross lesions of lungs from Bbs and Ahs at 14th dpi. A The lungs isolated from the thoracic cavity of Bashbay sheep, only a small amount of hemorrhagic spots were observed on the face of lungs; B The lungs isolated from the thoracic cavity of Argali hybrid sheep, there were much severer inflammatory lesions in lungs of Ahs than Bbs, including large-scale red and gray hepatization and bulge nodules. Typical lesions are pointed out by the black arrows in the above figures