Table 5 The yearly status of herds in NI relative to the number of samples taken per herd for the years 2011–2013, respectively. Note, the cut-point where there were no fluke free herds was 160 animals sampled in 2011, 227 in 2012, and 302 in 2013

Herd status (2011)

Samples

1–4

5–9

10–19

20–39

40–79

80–159

>160

Total

0

4,019

543

225

93

7

3

0

4,890

%

64.46

28.16

12.14

5.26

0.59

0.53

0

35.16

1

2,216

1,385

1,629

1,676

1,188

562

361

9,017

%

35.54

71.84

87.86

94.74

99.41

99.47

100

64.84

Total

6,235

1,928

1,854

1,769

1,195

565

361

13,907

Herd status (2012)

1–4

5–9

10–19

20–39

40–79

80–159

>160

Total

0

4,255

600

325

127

35

3

1

5,346

%

69.91

31.88

17.74

7.35

2.94

0.52

0.28

39.15

1

1,831

1,282

1,507

1,602

1,155

576

356

8,309

%

30.09

68.12

82.26

92.65

97.06

99.48

99.72

60.85

Total

6,086

1,882

1,832

1,729

1,190

579

357

13,655

Herd status (2013)

1–4

5–9

10–19

20–39

40–79

80–159

>160

Total

0

3,508

560

289

98

36

7

4

4,502

%

68.68

32.60

16.71

5.58

3.04

1.24

1.07

36.2

1

1,600

1,158

1,441

1,657

1,148

559

370

7,933

%

31.32

67.40

83.29

94.42

96.96

98.76

98.93

63.8

Total

5,108

1,718

1,730

1,755

1,184

566

374

12,435

Grand total negative

11,782

1,703

839

318

78

13

5

14,738

Grand total positive

5,647

3,825

4,577

4,935

3,491

1,697

1,087

25,259

Grand total

17,429

5,528

5,416

5,253

3,569

1,710

1,092

39,997