农民肺主要是由呼吸道吸入嗜热放线菌属通过免疫学机理引起发病。本病为弥漫性肉芽肿样间质性肺炎。首先在接触发霉牧草和谷类的农民中发现,故名农民肺。一、发病机理严格地讲本病发病机理尚不清楚,一般认为,属于变态反应Ⅲ型(免疫复合物型)和Ⅳ型(迟发型)的混合型。最近,对非特异性免疫 Farmers’ lungs are primarily caused by the immunological mechanism caused by inhaled thermophilic actinomycetes from the respiratory tract. The disease is diffuse granulomatous interstitial pneumonia. First found in farmers exposed to moldy pastures and cereals, hence the name farmers lungs. First, the pathogenesis Strictly speaking, the pathogenesis of this disease is not clear, is generally believed that belongs to allergic type Ⅲ (immune complex type) and Ⅳ (delayed type) mixed type. Recently, non-specific immunity