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Mechanisms of Resistance in Multiple-Antibiotic-Resistant Escherichia coli Strains of Human, Animal, and Food Origins

Área Bioquímica y Biología Molecular, Universidad de La Rioja, Logroño,¹ Servei de Microbiología, Institut Clínic d'Infeccions i Immunología, IDIBAPS, Hospital Clínic, Facultat de Medicina, Universitat de Barcelona, Barcelona, Spain²

Received 3 March 2004/ Returned for modification 21 April 2004/ Accepted 1 June 2004

Seventeen multiple-antibiotic-resistant nonpathogenic Escherichia coli strains of human, animal, and food origins showed a wide variety of antibiotic resistance genes, many of them carried by class 1 and class 2 integrons. Amino acid changes in MarR and mutations in marO were identified for 15 and 14 E. coli strains, respectively.

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