Table 1.
Mean farm-level prevalence of bovine E. coli O157 shedding for the SEERAD (March 1998-May 2000) and IPRAVE (February 2002-February 2004) surveys.
| Category | Mean Prevalence (lower, upper 95% confidence limits) |
P-value | |
|---|---|---|---|
| SEERAD | IPRAVE | ||
| All categories | 0.218 (0.141, 0.320) | 0.205 (0.135, 0.296) | 0.831 |
| By season | |||
| Spring | 0.222 (0.144, 0.325) | 0.191 (0.125, 0.279) | 0.614 |
| Summer | 0.230 (0.150, 0.335) | 0.262 (0.177, 0.367) | 0.637 |
| Autumn | 0.262 (0.173, 0.375) | 0.231 (0.154, 0.330) | 0.648 |
| Winter | 0.149 (0.094, 0.229) | 0.130 (0.082, 0.199) | 0.674 |
| By animal health district | |||
| Highland | 0.153 (0.096, 0.234) | 0.198 (0.130, 0.289) | 0.396 |
| North East | 0.248 (0.163, 0.359) | 0.199 (0.130, 0.290) | 0.442 |
| Central | 0.249 (0.164, 0.359) | 0.204 (0.134, 0.296) | 0.480 |
| South West | 0.189 (0.121, 0.283) | 0.261 (0.177, 0.366) | 0.257 |
| South East | 0.189 (0.166, 0.364) | 0.231 (0.168, 0.354) | 0.374 |
| Islands | 0.171 (0.108, 0.259) | 0.111 (0.070, 0.172) | 0.197 |
| By phage type | |||
| PT2 | 0.033 (0.002, 0.352) | 0.017 (0.008, 0.034) | 0.857 |
| PT8 | 0.011 (0.006, 0.020) | 0.019 (0.01, 0037) | 0.278 |
| PT21/28 | 0.135 (0.067, 0.252) | 0.124 (0.066, 0.219) | 0.865 |
| PT32 | 0.031 (0.0021, 0.378) | 0.060 (0.019, 0.176) | 0.779 |