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Journal of Clinical Microbiology, October 2001, p. 3724-3726, Vol. 39, No. 10
0095-1137/01/$04.00+0   DOI: 10.1128/JCM.39.10.3724-3726.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Increased Prevalence of Class I Integrons in Escherichia coli, Klebsiella Species, and Enterobacter Species Isolates over a 7-Year Period in a German University Hospital

Franz-Josef Schmitz,1,2,* Dieter Hafner,3 Roland Geisel,1 Patrick Follmann,1 Christian Kirschke,1 Jan Verhoef,2 Karl Köhrer,1 and Ad C. Fluit2

Institute for Medical Microbiology and Virology1 and Institute of Pharmacology and Clinical Pharmacology,3 Heinrich-Heine University Düsseldorf, Düsseldorf, Germany, and Eijkman-Winkler Institute for Medical Microbiology, University Medical Center Utrecht, Utrecht, The Netherlands2

Received 28 December 2000/Returned for modification 31 May 2001/Accepted 18 July 2001

The prevalence of integrons in five enterobacterial species was analyzed in 900 blood culture isolates from 1993, 1996, and 1999. Remarkably, the prevalence increased from 4.7% in 1993 to 9.7% in 1996 and finally to 17.4% in 1999 (P < 0.01). Within 7 years the combined percentage of P1 strong promoters and P1 weak plus P2 active promoters with high transcription efficacies has increased from 23.1 to 33.3 and finally 60% (P < 0.05).

* Corresponding author. Mailing address: Institute for Medical Microbiology and Virology, Heinrich-Heine-University Düsseldorf, Universitätsstraße 1, Geb. 22.21, D-40225 Düsseldorf, Germany. Phone and fax: 0049-2132-72040. E-mail: schmitfj{at}uni-duesseldorf.de.

Journal of Clinical Microbiology, October 2001, p. 3724-3726, Vol. 39, No. 10
0095-1137/01/$04.00+0   DOI: 10.1128/JCM.39.10.3724-3726.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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