为观察及评价乳酸左氧氟沙星静脉滴注及口服序贯治疗下呼吸道细菌性感染的临床疗效,将入选病例随机分为两组:乳酸左氧氟沙星治疗组和头孢他啶对照组,进行临床疗效、细菌清除率、不良反应的观察。结果乳酸左氧氟沙星序贯治疗的临床疗效及细菌清除率与头孢他啶相似,均较高。因乳酸左旋氧氟沙星序贯治疗费用相对低廉,较第三代头孢菌素的传统治疗更为优越 To observe and evaluate the clinical efficacy of intravenous infusion of levofloxacin lactate and oral sequential treatment of bacterial infections of lower respiratory tract, the selected cases were randomly divided into two groups: levofloxacin lactate treatment group and ceftazidime control group, clinical efficacy, bacterial clearance, poor Observation of the reaction. Results The sequential treatment of levofloxacin lactate clinical efficacy and bacterial clearance rate similar to ceftazidime, were higher. Due to the relatively low cost of sequential treatment of levofloxacin lactate, more superior to the traditional treatment of third-generation cephalosporins