目的： 了解老年人下呼吸道感染时机体细胞免疫状态，为合理有效的干预提供一定的参考。

Objective: To collect information of the cellular immunity of aged patients with lower respiratory infection, and so as to provide reference for reasonable and effective intervention of the disease.

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目的对照研究利复星（LVFX）与奥复星（OFLX）治疗老年人下呼吸道细菌感染的临床疗效及安全性。

Objective To compare the efficacy and safety of levofloxacin (LVFX) and ofoxacin (OFLX) in treatment of lower respiratory tract bacterial infections (LRTBI) in the aged.

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