FIG 1.

Whole-genome relationships of sorbitol-fermenting (SF) EHEC O157:H⁻ Czech (258/98) and German (493/89 and 3072/96) strains in comparison to non-sorbitol-fermenting (NSF) EHEC O157:H7 strains. The minimum spanning tree is based on allelic profiles derived from sequences of 2,299 core genome genes present in all strains (shown in Table S1 in the supplemental material). Each circle represents a given allelic profile based on these 2,299 target genes. SF and NSF EHEC O157 strains are distinguished by the colors of the circles. The numbers on the connecting lines illustrate the numbers of alleles by which the respective strains differ.