①大肠杆菌（Escherichiacoli，E.Coli）：按其致病机制分类为致病性大肠杆菌（Entero-pathogenicE.Coli，EPEC）、产毒素性大肠杆菌（EnterotoxigenicE.Coli，ETEC）、侵袭性大肠杆菌（EnteroinvasiveE.Coli，EIEC）、出血性大肠杆菌（EnterohemorrhagicE.Coli，EHEC）以及黏附性大肠杆菌（EnteroadhesiveE.Coli，EAEC）；②空肠弯曲菌（Campylobacterjejuni）；③耶尔森菌（Yersiniaentero-colitica）；④其他：鼠伤寒沙门菌（Salmonellatyphimurium）、变形杆菌（proteus）、铜绿假单胞菌（Pseudomonasaeruginosa）、克雷伯菌（Klebsiella）、金黄色葡萄球菌（Staphlococcusaureus）以及难辨梭状芽胞杆菌（Clostridiumdifficile）等。
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