Characteristics of Shiga toxin 2f-producing Escherichia coli isolates that were isolated in this study.

*astA, heat-stable toxin 1; lpfAO26, major subunit of long polar fimbriae of STEC O26; sfpA, major fimbrial subunit of Sfp fimbriae; irp2, iron-repressible protein 2; fyuA, ferric yersiniabactin uptake receptor; cdt, cytolethal distending toxin; EHEC-hlyA, enterohemorrhagic E. coli hemolysin: bfpA, major pilin structural unit bundling; iha, iron-regulated gene A homolog adhesin; espP, extracellular serine protease; efa1, enterohemorrhagic E. coli factor for adherence (Efa-1); pagC, outer membrane invasion protein.†MMC, mitomycin C.‡Type A is as same as the sequence of O128:H2 isolates (AJ270998 and AJ 010730) in Europe, compared across 1,230 bp; Type B is as same as the sequence of an O63 isolate (AB232172) from Nagasaki, Japan, compared across 1,230 bp.§+, positive; −, negative.‖OUT, untypeable in O serogroup.