普通常见的病毒感染,受染的机体常表现出明显的炎症反应,其感染过程具有急性疾病的一般特征。而近些年来发现,某些慢性疾病,特别是神经系统慢性进行性疾病,也与病毒感染有关,并且已从一些动物和人类神经系统慢性变性疾病中分离出了病毒和类似病毒的致病因子。人们曾把这类引起慢性进行性疾病的病毒看成是一组特殊的病 Common common viral infection, the infected body often shows a clear inflammatory response, the infection process has the general characteristics of acute diseases. In recent years, however, it has been found that certain chronic diseases, especially chronic progressive diseases of the nervous system, are also associated with viral infections and virus and virologic virulence factors have been isolated from a number of chronic degenerative diseases of the nervous system of animals and humans . People have these viruses that cause chronic progressive disease as a set of special diseases