免疫是机体对抗原物质的一种防御反应,有传染性免疫与非传染性免疫之分,前者系指机体对病原微生物的免疫,后者包括自身免疫性疾病、肿瘤免疫、组织器官移植反应等。 任何事物总是一分为二的,免疫的后果,可对人体有利,如对抗病原微生物的侵袭;但也可对人体有害,引起疾病,如对自身组织的免疫反应,导致自身免疫性疾病。 自身免疫性疾病曾称自身侵袭性疾病,也叫白身变态反应。它是机体的正常组织被自身的免疫细胞或自身抗体所破坏,而产生的疾病。 Immunity is the body’s defensive response to antigens, infectious and non-infectious immune points, the former refers to the body’s immunity to pathogenic microorganisms, the latter including autoimmune diseases, tumor immunity, tissue and organ transplant reactions . Everything is always divided into two parts. The consequences of immunity can be beneficial to the human body, such as the attack against pathogenic microorganisms. However, it can also be harmful to the human body and cause diseases such as an immune response to self tissues and autoimmune diseases. Autoimmune diseases have been called their own invasive disease, also known as white body allergy. It is the body’s normal tissue is destroyed by its own immune cells or autoantibodies, and the resulting disease.