Fig. 4

Gross lesions and microscopic lesions of the livers from experimental chickens. Subcapsular hemorrhages (a, b and c) and lymphocytic periphlebitis (d, e and f) are indicated by arrows. a and d: uninfected chickens in cage-free (Negative) group; (b) and (e): inoculated chickens from cage-free (Inoculated) group; (c and f): chickens infected by contact with feces from cage-free (Inoculated) group. Tissues were stained with hematoxylin and eosin