All O26:H11 isolates were positive for eae, iha1, IpfAO113, IpfAO26, ehaA, efa1/lifA, ecf4, Z2099, nleE, nleB, paa, fyuA and ent/espL2n, and all were negative for saa, Ipf1O157/OI-141, Ipf2O157/OI-154, eibG, toxB, astA, cnf, cdtB I–IV, subA, nleC and pic. Among isolates from patients developing HUS of this serotype (n = 4), all isolates were positive for agn43EDL933, ureC, nleH1–2 and nleG2–3, and all were negative for pagC-like. This evidence concerns the gene NPHS1 and hemolytic-uremic syndrome.