Compared with Ah J-1 strain, outer membrane protein profiles and some biochemical characters of the mutant strain had changed, and some genes of main virulent determinants could not be expressed, such as proteases, amylase, DNase and hemolysin.

• 与J-1株相比,突变株的外膜蛋白图谱和部分生化特性发生改变; 胞外蛋白酶、淀粉酶、DNA酶、溶血素等几种主要毒力因子同时丧失;