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characterization of integrons in escherichia coli of the normal intestinal flora of swine.multiresistant escherichia coli isolates of the normal intestinal flora of healthy fattening pigs were examined for the presence of integron class 1 by xl (extra long) pcr. the class 1 integron was detected in 17 isolates originating from 14 healthy animals on seven different farms. one isolate contained two class 1 integrons. the inserted gene cassettes were characterized by dna sequencing and pcr. the ant(3")-ia gene responsible for resistance to streptomycin/spectinomycin was inserted in all ...199910647086
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