Table 4.
Apparent and True (estimated) herd prevalence of Mycobacterium avium subspecies paratuberculosis infection stratified by region
| Case definition A (1 +ve or more) ELISA- prevalence % (95% CI) | Case definition B (two or more +ve) ELISA-prevalence % (95% CI) | True Prevalence1 | Total Number of herds | |
|---|---|---|---|---|
| Including all animals | ||||
| National | 21.4 (18.4, 24.9) | 6.4 (4.7, 8.7) | 9.52,3 | 639 |
| Connaught | 12 (8.0, 18.1) | 2 (0.6, 6.0) | 6.22,4 | 180 |
| Leinster | 32 (24.5, 40.4) | 9 (5.2, 15.6) | 14.02,5 | 141 |
| Munster | 23 (17.9, 28.8) | 8 (4.9, 12.3) | 14.82,6 | 240 |
| Ulster | 19 (11.5, 30.0) | 8 (3.1, 16.6) | 12.82,4 | 78 |
| Dairy | 31.5 (24.6, 39.3) | 13.3 (8.7, 19.7) | 20.62,7 | 165 |
| Beef | 17.9 (14.6, 21.8) | 3.9 (2.4, 6.2) | 7.62,8 | 458 |
| Excluding animals aged <2 | ||||
| National | 19.0 (16.0, 22.3) | 5.8 (4.2, 8.0) | 9.32,9 | 632 |
| Connaught | 11.1 (7.1, 16.8) | 1.1 (0.1, 4.4) | 3.42,4 | 180 |
| Leinster | 27.1 (20.1, 35.4) | 7.8 (4.1, 14.0) | 14.52,10 | 140 |
| Munster | 21.4 (16.4, 27.3) | 7.7 (4.7, 12.1) | 13.82,11 | 234 |
| Ulster | 15.4 (8.5, 25.7) | 7.7 (3.1, 16.6) | 12.62,4 | 78 |
| Dairy | 30.4 (23.6, 38.2) | 12.4 (7.9, 18.8) | 19.62,12 | 161 |
| Beef | 15.2 (12.0, 18.9) | 3.5 (2.1, 5.8) | 6.32,13 | 455 |
1 Based on a test sensitivity of 27.8% and specificity of 99.8%.
2 Based on herds with two or more ELISA-positive animals.
3 True herd prevalence based on grouping herds into four groups based on herd size (<= 11, 12-24, 25-43, >43).
4 True herd prevalence calculated for all herds, i.e., there was no grouping by herd size.
5 True herd prevalence based on grouping herds into two groups based on herd size (<= 53, >53).
6 True herd prevalence based on grouping herds into two groups based on herd size (<= 51, >51).
7 True herd prevalence based on grouping herds into three groups based on herd size (<= 49, 50-74, >74).
8 True herd prevalence based on grouping herds into two groups based on herd size (<= 30, >30).
9 True herd prevalence based on grouping herds into four groups based on herd size (<= 9, 10-18.5, 18.6-34, >34).
10 True herd prevalence based on grouping herds into two groups based on herd size (<= 40.5, >40.5)
11 True herd prevalence based on grouping herds into two groups based on herd size (<= 41, >41).
12 True herd prevalence based on grouping herds into three groups based on herd size (<= 41, 42-56, >56).
13 True herd prevalence based on grouping herds into two groups based on herd size (<= 24, >24).