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First report of plasmid-mediated quinolone resistance determinant qnrS1 in an Escherichia coli strain of animal origin in Italy.


ABSTRACT: A qnrS1-positive strain of Escherichia coli was detected among 73 poultry isolates showing ciprofloxacin MICs of > or =0.125 microg/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.

SUBMITTER: Cerquetti M 

PROVIDER: S-EPMC2704678 | biostudies-literature | 2009 Jul

REPOSITORIES: biostudies-literature

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First report of plasmid-mediated quinolone resistance determinant qnrS1 in an Escherichia coli strain of animal origin in Italy.

Cerquetti Marina M   García-Fernández Aurora A   Giufrè Maria M   Fortini Daniela D   Accogli Marisa M   Graziani Caterina C   Luzzi Ida I   Caprioli Alfredo A   Carattoli Alessandra A  

Antimicrobial agents and chemotherapy 20090518 7


A qnrS1-positive strain of Escherichia coli was detected among 73 poultry isolates showing ciprofloxacin MICs of > or =0.125 microg/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  ...[more]

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