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Journal of Clinical Microbiology, December 2002, p. 4679-4684, Vol. 40, No. 12
0095-1137/02/$04.00+0     DOI: 10.1128/JCM.40.12.4679-4684.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Molecular Characterization of Cephalosporin-Resistant Salmonella enterica Serotype Newport Isolates from Animals in Pennsylvania

Shelley C. Rankin,1* Helen Aceto,2 Jennifer Cassidy,1 Jeff Holt,1 Sheri Young,1 Brenda Love,3 Deepanker Tewari,4 Donald S. Munro,1 and Charles E. Benson1

Salmonella Reference Center,1 Center for Animal Health and Productivity, New Bolton Center, University of Pennsylvania School of Veterinary Medicine, Kennett Square, Pennsylvania 19348-1692,2 Animal Diagnostic Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802,3 Pennsylvania Veterinary Laboratory, Bureau of Animal Health and Diagnostics, Harrisburg, Pennsylvania 171104

Received 28 May 2002/ Returned for modification 20 July 2002/ Accepted 25 September 2002

Multidrug-resistant (MDR) strains of Salmonella enterica serotype Newport have been described for many years. However, the recognition of Newport strains with resistance to cephalosporin antibiotics is more recent. Plasmid-mediated CMY-2 AmpC ß-lactamases have been identified in Salmonella in the United States, and the blaCMY-2 gene has been shown to be present in Salmonella serotype Newport. This organism is currently undergoing epidemic spread in both animals and humans in the United States, and this is to our knowledge the first description of the molecular epidemiology of this Salmonella strain in animals. Forty-two isolates were included in this study. All isolates were characterized by pulsed-field gel electrophoresis, plasmid analysis, and antibiogram. Four pulsed-field profiles with XbaI were observed. Plasmid analyses showed that although the majority of isolates harbored a single plasmid of 140 kb, this plasmid was not identical in all strains. All isolates showed the presence of the blaCMY gene by PCR. Integrons were detected in 16 of the 42 isolates; a fragment of approximately 1,000 bp, amplified with the intI-F and aadAI-R primers, confirmed the presence of the aadAI gene cassette within an integron in these 16 isolates. The potential for coselection of the blaCMY gene, if located on an MDR replicon, may not be dependent on any particular antibiotic but rather may be the result of more general antimicrobial use. If this replicon is mobile, it is to be expected that similar MDR strains of additional Salmonella serotypes will be recognized in due course.

* Corresponding author. Mailing address: Salmonella Reference Center, University of Pennsylvania School of Veterinary Medicine, New Bolton Center, 382 West Street Rd., Kennett Square, PA 19348-1692. Phone: (610) 444-5800, ext. 2596. Fax: (610) 925-8115. E-mail: srankin{at}vet.upenn.edu.

Journal of Clinical Microbiology, December 2002, p. 4679-4684, Vol. 40, No. 12
0095-1137/02/$04.00+0     DOI: 10.1128/JCM.40.12.4679-4684.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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