下呼吸道感染是临床常见呼吸系统疾病。在细菌、病毒、真菌、支原体等众多致病因素中 ,以细菌性感染最常见。我科 1998年 10月～ 2 0 0 0年 6月应用氟罗沙星治疗下呼吸道感染 5 0例 ,取得满意效果。现报道如下。1　临床资料1.1　一般资料 :5 0例患者均为本院收治患者 ,其中男2 Lower respiratory tract infection is a common clinical respiratory disease. In bacteria, viruses, fungi, mycoplasma and many other risk factors, the most common bacterial infection. Our department from October 1998 to June 2000 application of fleroxacin 50 cases of lower respiratory tract infection, and achieved satisfactory results. Report as follows now. 1 Clinical data 1.1 General information: 50 patients were admitted to our hospital patients, of whom 2 men