人们之所以容易患感染性疾病,特别是被细菌这种小不点的微生物所轻易击倒,很大程度上就与人的机体免疫功能低下有关。目前令人谈虎色变的艾滋病,其致命关键就在于艾滋病病毒侵入人体后,直接在T细胞中繁殖,并使之死亡。待到疾病晚期时,患者体内的T细胞就差不多绝迹,对外来致病微生物毫无还手之力,所以必然走上死亡之路。那么是不是人体的免疫功能越强,反应越激烈,对健康就越有好处呢?回答是否定的。实际上,免疫功能过强,或对外来抗原做出过激的反应,有时甚至比免疫功能低下更加可怕。像时下越来越多见的过敏性哮喘,像青霉素皮试过敏导致的猝死,像急性病毒性肝炎、肾炎以及类风性温关节炎等,都是由于机体免疫应答过强造成的。由于免疫系统不适当地发动“武装斗争”,由于它的识别能力出现缺陷,才易于导致变态反应性疾病和自身免疫性疾病的发生。而且更让医生头 The reason why people are prone to infectious diseases, especially by the small bacteria such as bacteria easily knocked down, to a large extent with the body’s immune dysfunction. At present, the key to fatal transformation of AIDS lies in the fact that the AIDS virus invades the human body and directly multiplies in T cells and causes death. Until the late stage of disease, the patient’s T cells are almost extinct, the external pathogenic microorganisms have no fight back, so inevitably embarked on the road to death. So is the body’s immune function is stronger, the more intense the reaction, the more health benefits? The answer is no. In fact, immune function is too strong, or over-react with foreign antigens, and sometimes even more terrible than immune dysfunction. As more and more common allergic asthma nowadays, like penicillin skin allergy-induced sudden death, such as acute viral hepatitis, nephritis and wind-like arthritis, are due to the body’s immune response caused by too strong. Because the immune system improperly launches “armed struggle”, allergic diseases and autoimmune diseases can easily lead to the occurrence of allergic diseases due to defects in its ability to recognize. And let the doctor more head