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

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.

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