TABLE 1.
Distribution of E. coli O157 virulence genes among animals during the first two antemortem collection periods
| Genotypea | Collection 1b
|
Collection 2b
|
||
|---|---|---|---|---|
| No. of animals shedding | % of animals | No. of animals shedding | % of animals | |
| rfb fliCh7eae stx1stx2 | 314 | 39.8 | 265 | 33.6 |
| rfb stx1 | 32 | 4.1 | 156 | 19.8 |
| rfb stx1stx2 | 3 | 0.4 | 0 | 0.0 |
| rfb eae stx1stx2 | 9 | 1.1 | 42 | 5.3 |
| rfb fliCh7stx1stx2 | 1 | 0.1 | 0 | 0.0 |
| Total | 359 | 45.5 | 463 | 58.7 |
a
rfb encodes the O157 antigen, fliCh7 encodes the H7 antigen, eae encodes intimin, stx1 encodes Shiga toxin 1, and stx2 encodes Shiga toxin 2.
b
All 788 animals were sampled during collections 1 and 2.