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Genes involved in EHEC pathogenesis. Genes involved in EHEC pathogenesis are similar to those implicated for EPEC, except for the presence of the Stx-encoding phage on the EHEC chromosome and the presence of the characteristic EHEC 60-MDa plasmid instead of the EAF plasmid of EPEC. The EHEC plasmid is known to encode the enterohemolysin (ehx) as well as a fimbrial antigen potentially involved in colonization.
