JAC Advance Access published online on July 8, 2004
Journal of Antimicrobial Chemotherapy, doi:10.1093/jac/dkh333
© 2004 by The British Society for Antimicrobial Chemotherapy
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1 Faculdade de Ciências da Nutrição e Alimentação, Universidade do Porto, Porto, Portugal; Laboratório de Microbiologia, Faculdade de Farmácia, Universidade do Porto, Rua Aníbal Cunha, no. 164, 4050-047 Porto, Portugal
* To whom correspondence should be addressed. E-mail: lpeixe{at}ff.up.pt.
Objectives: Characterization of the molecular basis for 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.
Revised May 14, 2004
Accepted May 19, 2004
Original article
Dissemination amongst humans and food products of animal origin of a Salmonella typhimurium clone expressing an integron-borne OXA-30
-lactamase
2 Instituto Nacional de Saúde Dr. Ricardo Jorge, Lisboa, Portugal
3 Laboratório de Microbiologia, Faculdade de Farmácia, Universidade do Porto, Rua Aníbal Cunha, no. 164, 4050-047 Porto, Portugal
Abstract 
-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.-lactams.
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