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近20多年来发现神经系统有些慢性进行性疾患与病毒感染有关,并且已从这些疾患中分离出病毒或找到类似病毒的致病因。例如,从亚急性硬化性全脑炎病人分离出麻疹病毒,从进行性多灶性白质脑病病人分离出Papova(乳多泡)病毒,从多发性硬化症病人分离出副粘病毒等等,因而证实这些疾患是由病毒感染所致。但,一般常见的病毒感染,受感染的机体表现为明显的炎症反应,其感染过程,具有急性疾病的一般特征,如流行性乙型脑炎、森林脑炎、单纯疱疹性脑炎等。与此相对应,人们把这些引起慢性进行性疾病的病毒,看成是一组特殊的病毒,为了与急性病毒区别,称此类病毒为慢病毒,
In the past two decades or so, some chronic progressive disorders of the nervous system have been found to be associated with viral infections, and viruses have been isolated from these disorders or pathogenic causes of similar viruses have been found. For example, measles virus is isolated from patients with subacute sclerosingitis encephalitis, Papova virus is isolated from patients with progressive multifocal encephalopathy, and paramyxoviruses are isolated from patients with multiple sclerosis and so on Confirmed that these diseases are caused by a virus infection. However, the common virus infection, the infected body showed a clear inflammatory response, the infection process, with the general characteristics of acute diseases, such as Japanese encephalitis, encephalitis, herpes simplex encephalitis and so on. Correspondingly, people regard these viruses that cause chronic progressive diseases as a special group of viruses. To distinguish them from acute viruses, they are called lentiviruses,