自湖北省荆州市某鸭场送检病料中分离到一株疑似鸭大肠杆菌,经选择性培养基培养、生化试验、PCR鉴定、动物回归试验、药物敏感性试验,确认为鸭大肠杆菌,该菌对多种抗生素具有耐药性,用已分离鉴定的大肠杆菌经腹腔注射途径感染15日龄雏鸭,致病性试验结果显示,经腹腔注射途径感染雏鸭死亡率达100%,引起纤维素性心包炎、肝被膜炎和气囊炎,说明此株大肠杆菌具有强致病性.%A suspected E. coli from ducklings was isolated in Jingzhou of Hubei province. After selective culturing, biochemical test. PCR identif'ication, regression test and medicine-resistance test, it was identif'ied to be Escherishia coli from ducklings with high resistance to several antibiotics. Subsequently, some 15 day-old ducklings were infected with the E. coli isolates by lumbar injection for pathogenicity test. The results showed that the mortality of infected ducklings was 100％. In the dead ducks fibrinous pericarditis, glissonities and air sacculitis were also ohserved. It proved that this E. coli isolate was in high pathogenicity.
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