Abstract: This test separate to 54 plants duck highly pathogenic Escherichia coli source by the bacteria isolation, culture characteristic observation and biochemical test and pathogenic test, epidemic materials come from the Yellow River delta regional scale meat duck intestines goods in 2011. The drug sensitivity test found that separation strains of several antibiotics exist multiple resistance, wherein, three drug resistance of Phytomycin, Ampicillin and Clindamycin reached more than 90%. Higher sensitivity of drugs have Amikacin, Cefotaxime, Ceftriaxone and so on. This test identify preliminarily 12 kinds of serum type exist through O serum antigen type classification, including the region superiority serotype of O78, O35, O2, O18 were 12 strains, 8 strains, 6 strains and 5 strains. This test provide the reference for understanding and grasp the duck source area the epidemic of Escherichia coli disease and further research and prevention and control the disease.

Key words: the Yellow River delta regional; duck; Escherichia coli; isolation; identification