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Antimicrobial Agents and Chemotherapy, February 2005, p. 836-839, Vol. 49, No. 2
0066-4804/05/$08.00+0     doi:10.1128/AAC.49.2.836-839.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Dissemination of Sulfonamide Resistance Genes (sul1, sul2, and sul3) in Portuguese Salmonella enterica Strains and Relation with Integrons

Faculdade de Ciências da Nutrição e Alimentação,¹ Laboratório de Microbiologia, Faculdade de Farmácia, Universidade do Porto, Porto,² Instituto Nacional de Saúde Dr. Ricardo Jorge, Lisbon, Portugal³

Received 5 July 2004/ Returned for modification 16 September 2004/ Accepted 17 October 2004

In 200 sulfonamide-resistant Portuguese Salmonella isolates, 152 sul1, 74 sul2, and 14 sul3 genes were detected. Class 1 integrons were always associated with sul genes, including sul3 alone in some isolates. The sul3 gene has been identified in isolates from different sources and serotypes, which also carried a class 1 integron with aadA and dfrA gene cassettes.

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