Table I.
Prevalence of genes for Shiga toxins and Shiga toxin-producing Escherichia coli serotypes in composite fecal samples from pens of feedlot cattle in southern Alberta
| Feedlot pens
|
Feedlotsa |
||
|---|---|---|---|
| Targeted genes/pathogens | Positive/total | Percent positive | Positive/total |
| Shiga toxins (stx1 and/or stx2) | 23/25 | 92% (74.0% to 99.0%)b | 4/4 |
| O157:H7c | 2/25 | 8% (1.0% to 26.0%) | 2/4 |
| O111:H8c | 5/25 | 20% (6.8% to 40.7%) | 2/4 |
| O26:H11c | 20/25 | 80% (59.3% to 93.2%) | 4/4 |
a
Feedlots were considered positive when 1 or more pens in the feedlot tested positive
b
Figures in parenthesis indicate 95% exact confidence intervals
c
O157:H7, O111:H8, and O26:H11 positives include those positive for serotype-specific gene targets (eaeA genes) and Shiga toxin genes (stx1, stx2, or both)