Result of mouse virulence test showed that the genotypes of streptococcus,which were lethal to all of the mice,were mrp+,epf+ and sly+ serotype 2 strains. 1 serotype 2 strain and 1 serotype 7 strain could reproduce typical swine streptococcosis.

• 动物试验表明能100%25致死小白鼠的猪链球菌基因型均为epf+mrp+sly+2型猪链球菌,1株2型和1株7型猪链球菌均能复制出典型的猪链球菌病例。