The positive rates of bacteria cultures in MLN and pancreas were significantly lower in C group(37.5%) than those in A group(87.5%)( P =0.033).

• C组肠系膜淋巴结及胰腺组织细菌培养阳性率均为 37 5%25 ；明显低于A组的 87 5%25 (P =0 .；0 33)；培养出的细菌多为肠道常见细菌。