Summary of pathological findings*.

*The pathological scores of the intestinal specimens were classified into four grades as follows: no lesions seen (−); mild villous blunting and/or isolated hemorrhages (+); multifocal areas of moderate mucosal ulceration, villus blunting, and/or hemorrhage (++); severe mucosal ulceration characterized by severe structural destruction and abundant bacterial colonies in contact or within submucosal tissues and/or severe hemorrhage (+++).