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Antimicrobial Agents and Chemotherapy, July 2009, p. 3112-3114, Vol. 53, No. 7
0066-4804/09/$08.00+0     doi:10.1128/AAC.00239-09
Copyright © 2009, American Society for Microbiology. All Rights Reserved.

First Report of Plasmid-Mediated Quinolone Resistance Determinant qnrS1 in an Escherichia coli Strain of Animal Origin in Italy{triangledown}

Marina Cerquetti,1 Aurora García-Fernández,1 Maria Giufrè,1 Daniela Fortini,1 Marisa Accogli,1 Caterina Graziani,2 Ida Luzzi,1 Alfredo Caprioli,2 and Alessandra Carattoli1*

Departments of Infectious, Parasitic and Immune-Mediated Diseases,1 Veterinary Public Health and Food Safety, Istituto Superiore di Sanità, Rome, Italy2

Received 19 February 2009/ Returned for modification 3 April 2009/ Accepted 8 May 2009

A qnrS1-positive strain of Escherichia coli was detected among 73 poultry isolates showing ciprofloxacin MICs of ≥0.125 µg/ml. The qnrS1 gene was associated with a Tn3-like transposon, as previously described to occur in a Salmonella enterica serovar Infantis strain of animal origin, but the plasmid scaffold carrying this element resembled that of a plasmid previously identified in Salmonella enterica serovar Dublin. These elements suggest genetic exchanges among Salmonella and E. coli and a potential animal reservoir for the qnr genes.


* Corresponding author. Mailing address: Department of Infectious, Parasitic and Immune-Mediated Diseases, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy. Phone: 39-06-4990-3128. Fax: 39-06-4938-7112. E-mail: alecara{at}iss.it

{triangledown} Published ahead of print on 18 May 2009.


Antimicrobial Agents and Chemotherapy, July 2009, p. 3112-3114, Vol. 53, No. 7
0066-4804/09/$08.00+0     doi:10.1128/AAC.00239-09
Copyright © 2009, American Society for Microbiology. All Rights Reserved.




This article has been cited by other articles:

  • Fortini, D., Garcia-Fernandez, A., Veldman, K., Mevius, D., Carattoli, A. (2009). Novel genetic environment of plasmid-mediated quinolone resistance gene qnrB2 in Salmonella Bredeney from poultry. J Antimicrob Chemother 64: 1332-1334 [Full Text]