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Relationship of E. coli O55 and O157 strains to ECOR strains. Dendrogram demonstrates the clonal relationships of the ECOR collection (from Herzer et al. [16], with additions) and the strains examined in this paper. Study strains are connected to the closest ECOR relative based on MLEE. DEC1 and -2 strains (serotype O55:H6) fall outside the ECOR tree. Solid lines are based on analysis of 38 enzyme loci. Dashed lines are based on the analysis of 20 enzyme loci.
