TABLE 2.

Virulence markers presented by the STEC and non-STEC strains studied

Strain group and serotypeOriginaNo. of strainsPresence of the following virulence markers:
ehxstx1stx2beaeIntimin
STEC
    O26:H11HD, HUS5+++β
    O55:H19HD1+
    O77:H18HD1+++ (2c)d
Bovine2+ (1)c++ (2)
    O93:H19HD1+++ (2c)
Ground meat1++ (2)
    O103:H2HD, HA2+++ε
    O111:H8HD8+ (3)++θ
    O111:H11HD1++θ
    O111:HHD14+ (3)++θ
DC1+++ (2)+θ
    O118:H16HD2+++β
    ONT:H2HD1+++ε
    O157:H7HD, BD4++ (2/2c)+γ
Bovine1++ (2c)+γ
Water1++ (2)+γ
Non-STEC
    O26:H11HD14+ (11)+β (14)c
    O26:HHD4+ (2)+β (2), NT (2)
    O111:H2HD2+β
    O111:H11HD1+β
    O111:HHD3+α (1), β (1), γ (1)
    O111:H8HD1+θ
    O111:HNTHD1+α
    O157:HHD4+NT (4)
Total76
  • a HD, human diarrhea; HA, hemolytic anemia; BD, bloody diarrhea; DC, diarrheic calf.

  • b stx2c includes stx2vh-a and stx2vh-b.

  • c Values in parentheses in this column represent number of strains.

  • d Values in parentheses in this column represent subtypes.