| Site | E. coli | Frequency | Total (%) | χ2 | P value |
| Not contaminated (%) | Contaminated (%) | ||||
| Before carcass wash | 0 (0.0) | 31 (19.4) | 31 (19.4) | 0.9775 | 0.046 |
| After carcass wash | 15 (9.4) | 114 (71.3) | 129 (80.1) | ||
| Total | 15 (19.4) | 145 (90.6) | 160 (100.0) |