The effective treatment rate of Shuangyansan to ducklings infected by R.anatipestifer was 82.5%,without significant difference with florfenicol(P>0.05).

• 对感染里默氏杆菌的雏鸭的有效治疗率为82.；5%25；与氟甲砜霉素无明显的差异(P>0