老年人由于免疫力低下,容易罹患呼吸系统感染,如上呼吸道感染、急性支气管炎、慢性支气管炎急性发作、肺炎,而呼吸系统感染又常导致某些慢性疾病的加重,增加患病住院率。肺炎球菌及流感病毒为临床最常见致病病原体,目前常用接种肺炎球菌疫苗及流感疫苗的方法预防二者感染。对此 Elderly people are prone to respiratory infections such as upper respiratory tract infection, acute bronchitis, acute exacerbation of chronic bronchitis and pneumonia due to their low immunity. Respiratory infections often lead to the exacerbation of certain chronic diseases and increase the prevalence of ill-health. Pneumococcal and influenza viruses are the most common causative pathogens in clinical practice. At present, pneumococcal vaccines and influenza vaccines are commonly used to prevent both infections. This