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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.

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.
Published ahead of print on 18 May 2009.
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