目的 研究反复呼吸道感染(RRI)患儿红细胞免疫功能,探索RRI患儿的病因.方法 58例复感儿分别于感染期和非感染期测定红细胞免疫功能.结果 发现复感儿可分为A、B两组人群:A组感染期EC_3bRR明显降低(P<0.01),E-ICR明显升高(P<0.01);非感染期二者均恢复正常.B组感染期和非感染期EC_3bRR和E-ICR均降低(P<0.01和P<0.05).结论 复感儿存在原发性或继发性红细胞免疫功能低下,这是复感儿的主要病因之一. Objective To investigate the immune function of erythrocytes in children with RRI and to explore the etiology of RRI.Methods 58 cases of infantile respiratory distress syndrome were detected erythrocyte immune function during infection and non-infection respectively.The results showed that children with recurrent respiratory tract infection could be divided into A, In group B, EC3bRR was significantly lower (P <0.01) and E-ICR was significantly higher in group A (P <0.01), while both of the two groups returned to normal during non-infected period.The EC3bRR and E -ICR decreased (P <0.01 and P <0.05) .Conclusion The primary or secondary erythrocyte immunocompromised children with fulminant children, which is one of the main causes of complex flu children.