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Association of different risk factors with E. coli O157:H7 occurrence at animal level
| Variable | Total animals examined | Total animals positive (%) | Fisher’s exact test | p-value |
|---|---|---|---|---|
| Sex | ||||
| Male | 138 | 7 (4.7) | 0.63 | 1.0 |
| Female | 12 | 0 | ||
| Age | ||||
| 3 years | 25 | 2 (1.3) | 4.7 | 0.04 |
| 4–6 years | 81 | 1 (0.7) | ||
| ≥ 7 years | 44 | 4 (2.7) | ||
| Origin | ||||
| Tula | 40 | 2 (1.3) | 5.5 | 0.36 |
| Arsi Negelle | 24 | 3 (2) | ||
| Wondogenet | 7 | 0 | ||
| Hawassa | 30 | 0 | ||
| Yirgalem | 34 | 1 (0.7) | ||
| Tikurwoha | 13 | 1 (0.7) | ||
| Breed | ||||
| Crossbred | 13 | 0 (0) | 0.69 | 1.0 |
| Local (zebu) | 137 | 7 (4.7) | ||
