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Antimicrobial Agents and Chemotherapy, June 2009, p. 2640-2642, Vol. 53, No. 6
0066-4804/09/$08.00+0     doi:10.1128/AAC.00233-09
Copyright © 2009, American Society for Microbiology. All Rights Reserved.

Unusual Class 1 Integron-Associated Gene Cassette Configuration Found in IncA/C Plasmids from Salmonella enterica{triangledown}

Nick J. Evershed,1 Renee S. Levings,2 Neil L. Wilson,1 Steven P. Djordjevic,2,{dagger} and Ruth M. Hall1*

School of Molecular and Microbial Biosciences, The University of Sydney, New South Wales 2006, Australia,1 New South Wales Department of Primary Industries, Elizabeth Macarthur Agricultural Institute, Microbiology and Immunology Section, Camden, New South Wales 25702

Received 19 February 2009/ Returned for modification 14 March 2009/ Accepted 17 March 2009

IncA/C plasmids carrying an unusual cassette configuration in a class 1 integron and five further shared resistance genes, aacC4, aphA1, hph, sul2, and tetA(D) were found in Salmonella enterica serovars Senftenberg and Ohio. A deletion formed using a short region of homology in the 5' conserved segment and the orfF cassette created an array with only part of orfF followed by the aadA2 cassette. The IncA/C plasmids were not recoverable by conjugation, but additional conjugative resistance plasmids were present in some strains.

* Corresponding author. Mailing address: School of Molecular and Microbial Biosciences, Biochemistry and Microbiology Building G08, The University of Sydney, NSW 2006, Australia. Phone: 61-2-9351-3465. Fax: 61-2-9351-4571. E-mail: ruth.hall{at}mmb.usyd.edu.au

{triangledown} Published ahead of print on 23 March 2009.

{dagger} Present address: Institute for the Biotechnology of Infectious Diseases, University of Technology Sydney, Ultimo, NSW 2007, Australia.

Antimicrobial Agents and Chemotherapy, June 2009, p. 2640-2642, Vol. 53, No. 6
0066-4804/09/$08.00+0     doi:10.1128/AAC.00233-09
Copyright © 2009, American Society for Microbiology. All Rights Reserved.





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