Escherichia coli is an important intestinal flora,but pathogenic E.coli can cause disease in humans and animals.Over the years,Escherichia coli had caused serious economic losses to livestock and poultry breeding industry and had a great impact on human health. Therefore, the research on pathogenic mechanism of Escherichia coli is urgent. The authors summarized the recent progress in the study of virulence factors such as pathogenic enter...