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1·Muramidase released protein (MRP) is a key virulence factor of SS2.

溶菌酶释放蛋白（MRP）是SS2的主要毒力因子之一。

2·Objective:To construct mouse peritonitis models of Enterococcus for the study of the putative virulence factor of Enterococcus.

目的：建立肠球菌毒力相关性小鼠腹膜炎模型，用于肠球菌类毒力因子的研究。

3·It is suggested that virulence of rice brown planthopper was variable and the character of variety resistant or susceptible to insect was the exterior factor of virulent shift.

这表明褐飞虱的致害性是可变异的，水稻品种抗、感虫特性是其转化的诱因。