下呼吸道反复感染是煤工尘肺(ＣＷＰ)最常见合并症,也是ＣＷＰ病人死亡的主要原因之一,机体免疫功能下降是本病发病基础[1],分枝杆菌多糖(ＭＰＳ)有调节人体免疫功能的作用[2],为此我们将其用于反复发生下呼吸道感染的ＣＷＰ病人,观察临床效果。1　对象与方法　　表1两组病人下 Repeated infection of the lower respiratory tract is the most common complication of coal worker’s pneumoconiosis (CWP) and one of the major causes of death in CWP patients. The decline of immune function is the basis of this disease [1]. Mycobacterium polysaccharide (MPS) Function [2], for which we will use it for recurrent lower respiratory tract infection in CWP patients, to observe the clinical effect. 1 objects and methods Table 1 two groups of patients under