Toclarify Whether the infectious clone derived viruses has the same immwhty as FDD,the 4 donkeys inoculated with PD9 and PD9L2 were challenged with donkey adaPtedequine infectious anemia virus (DA-EIAV), a wild-type pathogenic Strain.

• 为鉴定感染性分子克隆毒是否具有与FDD和DLV同样的免疫效果，又对PD9和PD9L2分别接种的4头驴用驴系马传贫强毒(Donkey adapted equine infectious anemia virus，DA-EIAV)进行了攻击试验。