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Applied and Environmental Microbiology, January 2002, p. 440-443, Vol. 68, No. 1
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.1.440-443.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Natural Genetic Transformation of Clinical Isolates of Escherichia coli in Urine and Water

Markus Woegerbauer,1* Bernard Jenni,2 Florian Thalhammer,1 Wolfgang Graninger,1 and Heinz Burgmann1

Division of Infectious Diseases, Department of Internal Medicine I, University of Vienna, 1090 Vienna, Austria,1 Novartis Pharma AG, 4002 Basel, Switzerland2

Received 2 August 2001/ Accepted 8 October 2001

Transfer of plasmid-borne antibiotic resistance genes in Escherichia coli wild-type strains is possible by transformation under naturally occurring conditions in oligotrophic, aquatic environments containing physiologic concentrations of calcium. In contrast, transformation is suppressed in nitrogen-rich body fluids like urine, a common habitat of uropathogenic strains. Current knowledge indicates that transformation of these E. coli wild-type strains is of no relevance for the acquisition of resistance in this clinically important environment.

* Corresponding author. Mailing address: Department of Internal Medicine I, Division of Infectious Diseases, General Hospital of Vienna, Waehringerguertel 18-20, A-1090 Vienna, Austria. Phone: 0043/1/40400-4440. Fax: 0043/1/40400-5167. E-mail: markus.woegerbauer{at}akh-wien.ac.at.

Applied and Environmental Microbiology, January 2002, p. 440-443, Vol. 68, No. 1
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.1.440-443.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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