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Pulsed-field gel electrophoresis patterns of 34 strains of cytotoxin-producing Klebsiella oxytoca (the first isolate from each patient). The first isolate from each patient is listed in the dendrogram. MH43-1 is a standard strain of K. oxytoca, provided by Christoph Högenauer, Department of Internal Medicine, Medical University of Graz, Graz, Austria. *, copathogens were found in the stool samples; #, non-cytotoxin-producing strains of K. oxytoca, shown as a reference.
