三、病理变化,免疫致病机制,免疫诊断和保护性免疫班氏、马来和帝汶丝虫的感染期幼虫侵入人体,一般不引起任何症状。只有在第四期幼虫和童虫(1—3月后)蜕皮后才开始引起局部的炎症反应。除生殖器和肾的淋巴管病变只发生于班氏丝虫外,通常这三种丝虫的病理变化基本相似。受犯的淋巴结增 Third, the pathological changes, immune pathogenesis, immune diagnosis and protective immunity Banzai, Malay and Timorese filarial infection larvae invade the body, generally does not cause any symptoms. Only after the fourth instar larvae and juveniles (1-3 months later) molt began to cause a local inflammatory response. In addition to genital and renal lymphangitic lesions occurred only in Bancaris filariasis, usually three kinds of filarial pathological changes are similar. Convicted lymph nodes increased