老年人感染性疾病中,肺部感染居首,已成为老年人的重要死因,占各类死因的74.5%。有统计表明,肺炎死亡者中老年人约占70%,肺炎严重程度随年龄增长而加重。老年人重症肺炎链球菌肺炎引起的病死率约较青年高出3~4倍,60~70岁患者的病死率可达51%~61%。老年人肺部感染仍是本世纪需要面对的一大医学难题。体弱老人更易肺部感染老年人易发生肺部感染的原因有:1.老年人呼吸系统老化,体液及细胞免疫功能降低,呼吸道局部免疫 Infectious diseases among the elderly, lung infection top, has become an important cause of death of the elderly, accounting for 74.5% of all causes of death. Statistics show that pneumoconiosis accounted for about 70% of the elderly, the severity of pneumonia aggravated with age. Severe pneumococcal pneumonia in the elderly caused by about 3 to 4 times higher mortality than the youth, 60 to 70-year-old patients mortality of up to 51% to 61%. Pulmonary infection in the elderly is still a major medical problem to be faced in this century. The reason why the frail elderly are more susceptible to pulmonary infection The elderly are prone to pulmonary infections due to the following reasons: 1. Respiratory aging in the elderly, decreased humoral and cellular immunity, and local respiratory tract immunity