Table 3.

Association between serotype and virulence factor profiles among 90 STEC isolates

SerotypeNo. of isolatesVirulence factor profile (no.)WSBA resultcVero cell assay resultSorbitol fermentationProperty type (no.)a
O4:H251 ehxA stx 1 stx 2 ++PL (1)
O5:H b 16 ehxA stx 1 stx 2(3)+++MS (6), PL (2)
ehxA stx 1(12)+++
eaeA stx 1 +++
O8:Hnt2 ehxA stx 2 +++PL (1), MS (1)
+
O8:H491 ehxA stx 2 +MS (1)
(O8):K25:H162 ehxA stx 1 stx 2 (2)+++MS (1)
O75:H 4 ehxA stx 1 stx 2 (2)++MS (2)
ehxA stx 1(2)++
O75:H402 ehxA stx 1 stx 2 +MS (1), PL (1)
++
O84:H 2 ehxA stx 1 +++MS (1), PL (1)
ehxA eaeA stx 1 +++
O84:H161 ehxA stx 1 stx 2 +MS (1)
O85:H495 eaeA stx 1(3)+MS (2)
eaeA ehxA stx 2 +
ehxA stx 1 +
O91:H b 22 ehxA stx 1 (9)+++MS (5), PL (1)
(8)++
(1)+
ehxA stx 1 stx 2(2)++
(2)+++
O91:H281 ehxA stx 1 stx 2 +PL (1)
O123:H 8 ehxA eaeA stx 2 stx 1 ++MS (1), PL (4)
+++
ehxAstx 1(3)+++
ehxA stx 1 stx 2(3)+++
O128:H2b 11 ehxA stx 1 (8)+++MS (3), PL (2)
ehxA stx 1 stx 2(3)+++
O136:H401 eaeA stx 1 ++MS (1)
O157:H b 2 ehxA stx 1 stx 2 eaeA ++MS (2)
eaeA stx 2 ++
O166:H491 ehxA stx 1 +MS (1)
OX3:HR1 ehxA stx 1 +++MS (1)
OX3:H21 ehxA stx 1 +++MS (1)
Ont:H46 ehxA stx 1(5)+++MS (3), PL (1)
++
  • a PL, prime lamb; MS, mutton sheep.

  • b Serotype associated with human disease.

  • c A positive result indicates the ability to express enterohemolysin.