过去讨论免疫方面的问题仅考虑其预防传染病方面的作用。近十多年来免疫学取得了很大的进展,从而认识到免疫功能不仅能防止异物的感染,而且有免疫监护作用,可防止机体内的突变细胞及肿瘤的生成,并能识别移植的外来组织,对自体有平衡稳定的作 In the past, discussing the issue of immunization only considered its role in the prevention of infectious diseases. Over the past decade, immunology has made great progress, recognizing that immune function can not only prevent the infection of foreign bodies, but also has the function of immune surveillance. It can prevent the generation of mutant cells and tumors in the body, and can recognize the foreign bodies of transplanted animals. Organizations have balanced and stable self-