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(A) Piglets infected with wild-type strain NY-4 and T3SS1 KO mutant strain showed a mild to severe colonic submucosal and serosal edema (arrows). (B) No histological lesions were observed in the piglets infected with the T3SS2 KO strain. The sections were stained with hematoxylin and eosin. Magnification, ×100.
