Fig. 1

Gross lesions evaluation of lung samples at 28 dpi after necropsy. Whole lung samples connected to the trachea of each piglet were imaged after the animals were sacrificed. a and b Dorsal and ventral views of representative morphology images of lung gross lesions in the M. hyopneumoniae strain JS-infected group of the Bama miniature pigs; (c) and (d): Dorsal and ventral views of representative morphology images of lung samples in the control group of the Bama miniature pigs; (e) and (f): Dorsal and ventral views of representative morphology images of lung gross lesions in the M. hyopneumoniae strain JS-infected group of the conventional pigs; (g) and (h): Dorsal and ventral views of representative morphology images of lung samples in the control group of the conventional pigs