Conclusion bacterial change, drug resistant monitor and antimicrobial rational use should be paid attention. 结论应高度重视细菌变迁和耐药性监测，提高抗菌药物合理应用水平。
Conclusion Enoxacin is effective and safe in the treatment of lower respiratory tract bacterial infection of the old patients. 结论依诺沙星是有效和安全的治疗老年下呼吸道感染抗菌药物。
