变态反应的概念变态反应又称超敏反应,是免疫反应的一种。机体受某些抗原刺激后产生了免疫物质(抗体或致敏的淋巴细胞),使机体对这类抗原物呈高度过敏状态。但是,在尚未接触到这类物质之前并不发生过敏反应,即是说具有潜在发生过敏反应的性能称过敏性。所谓变态反应,就是具有过敏性机体再次受同一抗原物质刺激后产生的一种异常或病理性的应答,造成组织损伤或病变。关于变态反应的分类,现在根据变态反应发生机理及临床特点,将其分为四型:Ⅰ型称为IgE型、反应素型或过敏反应型:Ⅱ型称细胞溶解型或细胞毒型;Ⅲ型为免疫复合物型或血管炎型;Ⅳ The concept of allergy Allergy, also known as hypersensitivity, is a kind of immune response. The body is stimulated by some of the antigens generated immune substances (antibodies or sensitized lymphocytes), so that the body of these antigens was highly allergic state. However, an allergic reaction does not occur until such substance has been exposed to the substance, meaning that there is an allergic property that has the potential to cause an allergic reaction. The so-called allergic reaction is to have an allergic body again by the same antigen substances produced after stimulation of an abnormal or pathological response, resulting in tissue damage or lesions. On the classification of allergy, now based on the mechanism of allergic reaction and clinical features, will be divided into four types: Ⅰ type called IgE type, reactive or allergic reaction type: Ⅱ type cytolytic or cytotoxic; Ⅲ Type for the immune complex or vasculitis type; Ⅳ