预防接种是将生物制品接种到人体内,使机体产生抵抗感染的有益的免疫反应,但也可因生物制品的不同和机体的各异,而出现一些神经系统反应。其原因尚不太清楚,但在大脑白质、小脑、脑干和脊髓的切面上可看到许多细小黄红色病灶,这些区域 Vaccination is the biological products inoculated into the body, the body produces a beneficial immune response against infection, but also because of biological products and different body, and some nervous system reaction. The reason for this is not yet clear, but many small yellow-red lesions can be seen on the white matter, cerebellum, brainstem and spinal cord sections of the brain. These areas