| Isolates | Sea | Seb | Sec | Pvl | ClfA | Spa | |||||||
| n | % | n | % | n | % | n | % | n | % | n | % | ||
| Farm A | 27 | 0 | 0 | 0 | 0 | 1 | 3.7 | 0 | 0 | 1 | 3.7 | 11 | 40.74 |
| Farm B | 30 | 0 | 0 | 1 | 3.33 | 0 | 0 | 0 | 0 | 15 | 50 | 14 | 46.6 |
| Farm C | 12 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 5 | 41.6 |
| Farm D | 25 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 8 | 14 | 0 |
| TOTAL | 94 | 0 | 0 | 1 | 1.06 | 1 | 1.06 | 0 | 0 | 18 | 19.2 | 44 | 46.8 |