Skip to main content

Table 4 Apparent and True (estimated) herd prevalence of Mycobacterium avium subspecies paratuberculosis infection stratified by region

From: Prevalence and distribution of paratuberculosis (Johne's disease) in cattle herds in Ireland

 

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. 1 Based on a test sensitivity of 27.8% and specificity of 99.8%.
  2. 2 Based on herds with two or more ELISA-positive animals.
  3. 3 True herd prevalence based on grouping herds into four groups based on herd size (<= 11, 12-24, 25-43, >43).
  4. 4 True herd prevalence calculated for all herds, i.e., there was no grouping by herd size.
  5. 5 True herd prevalence based on grouping herds into two groups based on herd size (<= 53, >53).
  6. 6 True herd prevalence based on grouping herds into two groups based on herd size (<= 51, >51).
  7. 7 True herd prevalence based on grouping herds into three groups based on herd size (<= 49, 50-74, >74).
  8. 8 True herd prevalence based on grouping herds into two groups based on herd size (<= 30, >30).
  9. 9 True herd prevalence based on grouping herds into four groups based on herd size (<= 9, 10-18.5, 18.6-34, >34).
  10. 10 True herd prevalence based on grouping herds into two groups based on herd size (<= 40.5, >40.5)
  11. 11 True herd prevalence based on grouping herds into two groups based on herd size (<= 41, >41).
  12. 12 True herd prevalence based on grouping herds into three groups based on herd size (<= 41, 42-56, >56).
  13. 13 True herd prevalence based on grouping herds into two groups based on herd size (<= 24, >24).