“…Ahmed and Shimamoto reported the presence of plasmid‐mediated quinolone resistance genes, qnr B and qnr S, in 12.0% of O157 isolates from meat products in Egypt (Ahmed & Shimamoto, ). Recent studies reported several β‐lactamase genes, such as bla CTX‐M , bla AmpC , bla CMY‐1 , bla TEM and bla DHA‐1 in STEC serotypes O26:H11, O64, O91:H14, O106:H18, O111:H8 and O157, recovered from humans and animals; some of these β‐lactamase genes were encoded on plasmids (Arvand et al, ; Dutta et al, ; Ishii et al, ; Iweriebor et al, ; Jost et al, ; Valat et al, ). Seven O157 isolates harbouring bla CMY‐2 , obtained from clinical samples at the Osaka Prefecture, Japan, had antibiotic resistance genes encoded on a IncI1 plasmid that has high transmissibility across bacterial species (Kawahara et al, ).…”