These factors include adesins,endotoxin and exotoxins,of which the exotoxins are the major virulence factors,including toxic proteinases,enterexotoxins,hemolysins and siderophore.

• 该菌的毒力因子主要有外毒素、内毒素及黏附素等,其中外毒素是其重要的毒力因子,它包括毒性酶、肠毒素、溶血素和铁载体等。