免疫反应不仅是人体对抗致病性微生物的主要防御机构,也能对机体引起不良临床反应。免疫反应导致免疫保护或免疫过敏性疾病,取决于免疫反应对宿主的作用,而不表示免疫反应产生的机理有何不同。抗原进入人体后,大多数先由巨噬细胞所摄取和处理,再提供给淋巴细胞作识别。淋巴细胞有二种,即来自胸腺的T细胞和来自 Immune response is not only the body’s main defense against pathogenic microorganisms, but also can cause adverse clinical reactions to the body. Immune response leads to immune protection or immune-allergic diseases, depending on the immune response to the host, but does not indicate the mechanism of immune response is different. Antigens into the body, most of the first by the macrophages uptake and processing, and then provide lymphocytes for identification. There are two types of lymphocytes, T cells from the thymus and from