Table 1.

Potential virulence factors of STEC strains used in this study

SerotypeTotal no. of strainsNo. containingstx geneNo. containing eaeNo. containing EHEC hly
stx1stx2stx1plus stx2
O157:H7/H37225a10a3737
O26:H11/H31131533131
O103:H21312011313
O111:H149051413
O145:H1339a1a1313
O128:H2/H1221b9b07
Otherc863728d21d2145
Total206787850129159
  • a stx2 variant wasstx2c.

  • b stx2 variant wasstx2d.

  • c Fifty different serotypes within 39 O serogroups; the serotypes that comprised at least three strains were O8:H (six strains), O62:H (three strains), O78:H (three strains), O113:H (three strains), and O118:H (three strains).

  • d stx2 variant wasstx2c (nine strains) orstx2d (22 strains).