Journal Article

Dissemination amongst humans and food products of animal origin of a <i>Salmonella typhimurium</i> clone expressing an integron-borne OXA-30 β-lactamase

Patrícia Antunes, Jorge Machado, João Carlos Sousa and Luísa Peixe

in Journal of Antimicrobial Chemotherapy

Published on behalf of British Society for Antimicrobial Chemotherapy

Volume 54, issue 2, pages 429-434
Published in print August 2004 | ISSN: 0305-7453
Published online August 2004 | e-ISSN: 1460-2091 | DOI: http://dx.doi.org/10.1093/jac/dkh333
Dissemination amongst humans and food products of animal origin of a Salmonella typhimurium clone expressing an integron-borne OXA-30 β-lactamase

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Objectives: Characterization of the molecular basis for β-lactam resistance and evaluation of the clonal relatedness among nine isolates of multidrug-resistant Salmonella typhimurium recovered from seven clinical human samples and two pork end products.

Methods: The isolates were examined for susceptibility to antimicrobial agents. The relationships between resistance genes, class 1 integrons, plasmids and isolates were screened by molecular methods such as polymerase chain reaction and restriction fragment length analysis.

Results: A blaOXA-30 gene, located in a class 1 integron, was detected in all isolates. This integron was present on a conjugative plasmid in all but one isolate. By pulsed-field gel electrophoresis, it was determined that all strains share the same chromosomal type.

Conclusions: This study demonstrates the spread of an OXA-30-producing S. typhimurium in Portugal, suggesting dissemination of a resistant clone through the food chain.

Keywords: salmonellosis; food-borne diseases; class 1 integrons; antimicrobial resistance; β-lactams

Journal Article.  2749 words.  Illustrated.

Subjects: Medical Oncology ; Critical Care

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