TABLE 1.

E. coli strains used in this study

StrainSerotypeSourceaCharacteristicb
eaestx1stx2ehxA
94CRO48:H21HUS+++
95HE4O91:H7Diarrhea++
95NR1O111:HHUS++++
95SF2O157:HHUS+++
95ZG1O26:H?Diarrhea+++
97MW1O113:H21Bloody diarrhea, MHA-T++
98NK2O113:H21HUS++
98NK2-CuO113:H21Plasmid-cured 98NK2+
B2F1O91:H21HUS++
EDL933O157:H7Bloody diarrhea++++
EDL933-CuO157:H7Plasmid-cured EDL933+++
EPEC 87AO111:H?Diarrhea+
  • a STEC strains were originally isolated from the feces of patients with diarrhea, bloody diarrhea, HUS, or microangiopathic haemolytic anemia and thrombocytopenia (MHA-T).

  • b Determined by multiplex PCR (24); eae and ehxA are markers for the LEE pathogenicity island and the large STEC virulence plasmid, respectively.