In many countries ,much attention were paid to Streptococcus suis serotype 2 and many studies were foucus on virulence factors, extracellular protein factor(EPF), muraminidase-released protein(MRP) were two main virulence factors .

• SS_2在世界很多国家均受到重视,对它的研究主要集中在与毒力相关蛋白的研究上。 溶菌酶释放蛋白(muraminidase-released protein,MRP)和胞外蛋白因子(extracellular protein factor,EPF)是SS_2两个主要的致病因子。