Table 1.
Description of farms A–G, with herd size, pens sampled and age of calves sampled
| Farm | Herd size (individuals) | Pen | Animals sampled | Animals in pen | Pen size (m2) |
Age, (days) mean (SD) |
Campylobacter positive | |
|---|---|---|---|---|---|---|---|---|
| n | (%) | |||||||
| A | 380 | 1 | 3 | 4 | 6·4 | 33 (2·5) | 3 | 100 |
| 2 | 3 | 4 | 6·3 | 34 (6·1) | 3 | 100 | ||
| 3 | 3 | 4 | 6·3 | 50 (7·1) | 3 | 100 | ||
| 4 | 3 | 4 | 6·3 | 51 (5·9) | 3 | 100 | ||
| 5 | 14 | 20 | 48 | 99 (29) | 11 | 79 | ||
| B | 350 | 1 | 4 | 5 | 17 | 33 (4·4) | 2 | 50 |
| 2 | 7 | 7 | 13 | 78 (20) | 4 | 57 | ||
| 3 | 7 | 7 | 13 | 121 (21) | 5 | 71 | ||
| 4 | 1 | 1 | 13 | 42 (not applicable) | 1 | 100 | ||
| C | 350 | 1 | 8 | 18 | 150 | 219 (13) | 3 | 38 |
| 2 | 4 | 8 | 26 | 177 (9·2) | 4 | 100 | ||
| 3 | 8 | 12 | 36 | 118 (42) | 8 | 100 | ||
| 4 | 1* | 7 | 21 | 83 (not applicable) | 0 | 0 | ||
| D | 600 | 2 | 7 | 8 | 22 | 101 (12) | 7 | 100 |
| 3 | 6 | 6 | 20 | 122 (3·5) | 1 | 17 | ||
| 4 | 7 | 7 | 22 | 141 (38) | 2 | 29 | ||
| E | 300 | 1 | 3 | 4 | 7·2 | 61 (2·9) | 3 | 100 |
| 2 | 5 | 7 | 7·2 | 72 (9·7) | 5 | 100 | ||
| 3 | 5 | 7 | 7·2 | 92 (10) | 5 | 100 | ||
| 4 | 3 | 7 | 11 | 113 (46) | 1 | 33 | ||
| 5 | 7 | 6 | 10 | 232 (45) | 6 | 86 | ||
| F | 135 | 1 | 12 | 12 | 25 | 66 (24) | 9 | 75 |
| 2 | 6 | 6 | 30 | 134 (44) | 6 | 100 | ||
| 3 | 7 | 13 | 128 | 195 (46) | 4 | 57 | ||
| G | 130 | 1 | 3 | 3 | 5 | 135 (3·2) | 3 | 100 |
| 2 | 4 | 4 | 3·8 | 71 (7·8) | 4 | 100 | ||
| 3 | 2 | 3 | 5·5 | 143 (4·2) | 2 | 100 | ||
| 4 | 6 | 6 | 7·8 | 171 (25) | 6 | 100 | ||
| 5 | 3 | 3 | 2·7 | 43 (26) | 3 | 100 | ||
| 6 | 2 | 2 | 1·5 | 12 (4·9) | 2 | 100 | ||
| Total | 154 | 119 | 77% | |||||
*
A limited quantity of faeces was obtained from three calves, so analyses of STEC were given higher priority and the remaining faeces were used for analyses of Campylobacter.