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Antimicrobial Agents and Chemotherapy, April 2009, p. 1709-1711, Vol. 53, No. 4
0066-4804/09/$08.00+0 doi:10.1128/AAC.01014-08
Copyright © 2009, American Society for Microbiology. All Rights Reserved.
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Department of Veterinary Pathobiology, Faculty of Life Sciences, University of Copenhagen, Frederiksberg C, Denmark
Received 29 July 2008/ Returned for modification 1 November 2008/ Accepted 25 January 2009
CTX-M-1-producing Escherichia coli were isolated from 56 pigs, three farm personnel, two manure samples, and two air samples from two Danish pig farms where an association between prophylactic ceftiofur use and the occurrence of cephalosporin resistance was previously demonstrated. Human, animal, and environmental strains displayed high genetic diversity but harbored indistinguishable or closely related IncN plasmids carrying blaCTX-M-1, indicating that IncN plasmids mediating cephalosporin resistance were transmitted between pigs and farm workers across multiple E. coli lineages.
Published ahead of print on 2 February 2009.
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