Abstract
Plasmid DNA was extracted from all 38 strains of chicken Escherichia coli by alkaline lysis method. The agarose gel electrophoresis showed 23 plasmid patterns. The strains from the same source had the same, similar, or quite different plasmid profiles, while those from different sources generally did not have the same plasmid profiles. Therefore, the plasmid profiles can provide basic materials for epidemiological investigation on chicken Escherichia coli at molecular level.
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