Mellmann et al. analyzed a collection of 524 EHEC isolated from HUS patients and found that 169 (32.3%) belonged to 34 non-O157 serotypes and that profiles of stx1a only, stx1c only, stx1a+stx2a, stx1c+stx2a, stx1c+stx2d, stx2a only, stx2c only, stx2d only and stx2a+stx2c were present in these non-O157 STEC isolates [2]. This evidence concerns the gene STX1A and hemolytic-uremic syndrome.