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Journal of Clinical Microbiology, January 2005, p. 452-454, Vol. 43, No. 1
0095-1137/05/$08.00+0     doi:10.1128/JCM.43.1.452-454.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Phenotypic and Molecular Analysis of Tellurite Resistance among Enterohemorrhagic Escherichia coli O157:H7 and Sorbitol-Fermenting O157:NM Clinical Isolates

Martina Bielaszewska,1* Phillip I. Tarr,2 Helge Karch,1 Wenlan Zhang,1 and Werner Mathys1

Institut für Hygiene, Universitätsklinikum Münster, Münster, Germany,1 Division of Pediatric Gastroenterology and Nutrition, Edward Mallinckrodt Department of Pediatrics, Washington University School of Medicine and St. Louis Children's Hospital, St. Louis, Missouri2

Received 21 July 2004/ Returned for modification 2 September 2004/ Accepted 13 September 2004

A total of 66 (98.5%) of 67 enterohemorrhagic Escherichia coli (EHEC) O157:H7 strains had increased potassium tellurite (Te) MICs (32 to 1,024 µg/ml), grew on Te-containing media, and possessed Te resistance (ter) genes, whereas 83 (96.5%) of 86 sorbitol-fermenting (SF) EHEC O157:NM strains had Te MICs of ≤4 µg/ml, did not grow on Te-containing media, and lacked ter genes. Optimal detection of SF EHEC O157:NM strains requires Te-independent strategies.

* Corresponding author. Mailing address: Institut für Hygiene, Universitätsklinikum Münster, Robert Koch Str. 41, 48149 Münster, Germany. Phone: 49-251-8355361. Fax: 49-251-8355341. E-mail: mbiela{at}uni-muenster.de.

Journal of Clinical Microbiology, January 2005, p. 452-454, Vol. 43, No. 1
0095-1137/05/$08.00+0     doi:10.1128/JCM.43.1.452-454.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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