The target organ where virus located were chorioallantoic membrane and liver.The organelle changes included dilation of rough endoplasmic reticulum,mitochondria swelling and crista fragmentation.

• 病毒侵害的主要靶器官为尿囊膜与肝，细胞器的变化主要表现为粗面内质网扩张以及线粒体肿胀和嵴断裂、消失。