免疫较早的概念是指机体对感染的抵抗力。然而,随着人们认识的不断深入,免疫的概念已远远超出了抗感染这一范畴。目前,免疫功能包括: 免疫防御正常情况下,机体可以防御病原微生物等侵害。异常情况下,若反应过高,可引起变态反应;若反应过低或缺陷,则出现免疫缺陷病。自身稳定正常倩况下,机体能经常清除损伤和衰老的自身细胞,以维持饥体内的生理平衡。自 The concept of early immunity refers to the body’s resistance to infection. However, with the continuous deepening of people’s understanding, the concept of immunity has gone far beyond the anti-infection category. At present, immune functions include: Immune defense Under normal circumstances, the body can protect against pathogenic microorganisms and other violations. Abnormal circumstances, if the reaction is too high, can cause allergic reactions; if the reaction is too low or defective, then the emergence of immunodeficiency disease. Under normal conditions of its own stability, the body can often remove the damage and aging of their own cells in order to maintain the physiological balance within the body. from