变态反应(Allergy)一般是指机体再次受某种抗原刺激后产生的过强免疫反应,有的引起生理功能紊乱或组织损伤。通常将能激发变态反应的抗原性物质称为过敏原或变应原。1963年Gell 和Coombs 按照不同免疫反应的发生机制,将变态反应分为四型,即:第Ⅰ型一速发型变态反应,第Ⅱ型—细胞毒型变态反应;第Ⅲ型一免疫复合物变态反应;第Ⅳ型 Allergy (Allergy) generally refers to the body once again by a certain antigen stimulation produced by the strong immune response, and some cause physiological disorders or tissue damage. Antigenic substances that can provoke allergic reactions are usually called allergens or allergens. 1963 Gell and Coombs in accordance with the mechanism of the occurrence of different immune responses, the allergic reaction is divided into four types, namely: type Ⅰ first speed hair allergy, type Ⅱ - cytotoxic allergy; type Ⅲ immune complex metamorphosis Response; type Ⅳ