Ｏ157:Ｈ7大肠杆菌是引起人类出血性肠炎的主要致病菌,1982年美国首次从腹泻病人粪便中分离出该菌而受世人所认识之后,在国外不断有病例发生,也曾经报导从牛奶、牛肉、鸡肉、蔬菜、水果、饮料等检出了Ｏ157:Ｈ7大肠杆菌。[1]1999年1月6日,汕头出入境检验检疫局从一宗进口的泰国 O157: H7 Escherichia coli is the major cause of human haemorrhagic colitis. After the United States first isolated the bacteria from diarrhea patients in 1982 and recognized by the world, Escherichia coli continues to occur in other countries. It has also been reported from milk, O157: H7 Escherichia coli was detected in beef, chicken, vegetables, fruits and beverages. [1] January 6, 1999, Shantou Exit Inspection and Quarantine from a Thai import