Table 2:

Proportion of individual positive animals and milk tank (concentrated and not concentrated) results to antibodies to BoHV-1

Individual milk samplesNon-concentrated BTM samplesConcentrated BTM samplesStatus
FarmSampling*% positive animals† (LCL–HCL 95%)%IN‡ BTM
(cut-off≤25)
%IN BTM concentrated (cut-off≤5)Calculated prevalence
110.00.0 (neg)0.0 (neg)<4%
20.00.0
30.00.0
40.00.0
2197.6 (96.1–99.2)92.5 (pos)96.0 (pos)≥25%
293.9 (91.3–96.4)89.7 (pos)93.5 (pos)≥25%
398.2 (96,7–99.6)81.9
492.12 (89.2–95.0)89.3
314.5 (0.6–8.4)6.4 (neg)35.5 (pos)4%–25%
21.7 (0.00–4.0)10.6 (neg)12.1 (pos)4%–25%
31.5 (0.0–3.5)0.00
40.8 (0.0–2.4)0.9
415.0 (1.8–8.2)11.2 (neg)40.5 (pos)4%–25%
24.00 (1.1–6.9)18.1 (neg)30.3 (pos)4%–25%
32.2 (0.1–4.3)0.00
42.8 (0,4–5.3)19.5
5110.1 (6.9–13.2)20.8 (neg)48.6 (pos)4%–25%
26.5 (4.0–9.0)19.9 (neg)37.6 (pos)4%–25%
35.3 (3.1–7.5)0.00
46.3 (3.8–8.8)19.5
  • *Number of sampling. 1=autumn, 2= winter, 3= spring and 4= summer.

  • †% Positive animals referred for individual analysis.

  • ‡%IN: inhibition percentages.

  • Estimated prevalence according to the results of the BTM, whether concentrated or not.

  • BoHV-1, bovine herpesvirus type 1; BTM, bulk tank milk; HCL, higher concentration limit; LCL, lower concentration limit.