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Antimicrobial Agents and Chemotherapy, June 2007, p. 2201-2204, Vol. 51, No. 6
0066-4804/07/$08.00+0 doi:10.1128/AAC.01389-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Hospital Universitario Ramón y Cajal, IMSALUD, Madrid, Spain,1 Unidad de Resistencia a Antibióticos y Virulencia Bacteriana Asociada al Consejo Superior de Investigaciones Científicas, Madrid, Spain,2 REQUIMTE, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal,3 Faculdade de Ciências da Saúde, Universidade Fernando Pessoa, Porto, Portugal4
Received 6 November 2006/ Returned for modification 27 December 2006/ Accepted 22 March 2007
The variable presence of integrons among extended-spectrum beta-lactamase (ESBL)-producing Enterobacteriaceae species (0 to 66%) is described. Association between blaESBL and integrons occurred when these are linked to specific ESBL-type genes (In60 bearing ISCR1 and blaCTX-M-9) or when ESBL genes were superimposed onto selected plasmids carrying integrons. Some integrons were identical to those found during decades worldwide, illustrating the preservation of the genetic elements carrying them.
Published ahead of print on 2 April 2007.
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