TABLE 2.
Distribution of virulence genes in Shiga toxin-producing Escherichia coli strains.
| Pathotype | Serogroup | Positive sample |
Number of isolates carrying specific genes |
||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| No. | % |
stx1 |
stx2 |
eae |
stx2/stx1 |
stx1/eae |
stx2/eae |
stx1/stx2/eae |
|||||||||
| No. | % | No. | % | No. | % | No. | % | No. | % | No. | % | No. | % | ||||
| STEC | Non-O157 | 59 | 100.0 | 21 | 36 | 41 | 70 | 26 | 44.0 | 3 | 5.0 | 10 | 16.9 | 13 | 22.0 | 3 | 5.0 |
| O157 | 12 | - | 12 | - | 12 | - | 12 | - | 0 | - | 0 | - | 0 | - | 12 | - | |
| Total STEC | 71 | 100.0 | 33 | 46 | 53 | 75 | 38 | 54 | 3 | 4.2 | 10 | 14.0 | 13 | 18.3 | 15 | 21.1 | |
| Non-STEC | 241 | - | - | - | - | - | 63 | - | - | - | - | - | - | - | - | - | |
| Total | 312 | 100.0 | 33 | 11 | 53 | 17.0 | 101 | 32 | 3 | 0.9 | 10 | 3.2 | 13 | 4.1 | 15 | 4.8 | |
Overall: STEC, 71 (22.7%); Non-STEC, 241 (77.3%).
Overall: Non-O157, 52 (16.6%); O157, 12 (3.8%).
STEC, Shiga toxin-producing Escherichia coli; No., number; stx, isolates carrying stx1 and/or stx2 genes; eae, isolates carrying eae gene.
Note: The eae gene produces a 94-kDa outer membrane protein called intimin.