The glycoprotein EO of Classical swine fever virus(CSFV),besides being an envelope protein, possesses KNase activity,which is pertinent to viral persistent infection in the host.

• 猪瘟病毒(classical swine fever virus,CSFV)EO糖蛋白既是包膜蛋白，又是一种核酸酶，其活性对病毒在宿主体内的持续感染有直接关系。