FIG 1.

Cluster analysis of potential virulence genes in STEC strains. eae-negative and eae-positive STEC strains were mainly separated into two clusters. One exception was one eae-negative strain that clustered among the eae-positive strains due to the presence of some of the potential virulence genes. All HUS-associated strains clustered among the eae-positive strains and harbored all of the potential virulence genes investigated in the study. For further details (serotype, stx₂ subtype, etc.), see Fig. S1 in the supplemental material.