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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

From: Liver fluke (Fasciola hepatica) infection in cattle in Northern Ireland: a large-scale epidemiological investigation utilising surveillance data

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