Table 2:
Proportion of individual positive animals and milk tank (concentrated and not concentrated) results to antibodies to BoHV-1
| Individual milk samples | Non-concentrated BTM samples | Concentrated BTM samples | Status | ||
| Farm | Sampling* | % positive animals† (LCL–HCL 95%) | %IN‡ BTM (cut-off≤25) |
%IN BTM concentrated (cut-off≤5) | Calculated prevalence |
| 1 | 1 | 0.0 | 0.0 (neg) | 0.0 (neg) | <4% |
| 2 | 0.0 | 0.0 | – | – | |
| 3 | 0.0 | 0.0 | – | – | |
| 4 | 0.0 | 0.0 | – | – | |
| 2 | 1 | 97.6 (96.1–99.2) | 92.5 (pos) | 96.0 (pos) | ≥25% |
| 2 | 93.9 (91.3–96.4) | 89.7 (pos) | 93.5 (pos) | ≥25% | |
| 3 | 98.2 (96,7–99.6) | 81.9 | – | – | |
| 4 | 92.12 (89.2–95.0) | 89.3 | – | – | |
| 3 | 1 | 4.5 (0.6–8.4) | 6.4 (neg) | 35.5 (pos) | 4%–25% |
| 2 | 1.7 (0.00–4.0) | 10.6 (neg) | 12.1 (pos) | 4%–25% | |
| 3 | 1.5 (0.0–3.5) | 0.00 | – | – | |
| 4 | 0.8 (0.0–2.4) | 0.9 | – | – | |
| 4 | 1 | 5.0 (1.8–8.2) | 11.2 (neg) | 40.5 (pos) | 4%–25% |
| 2 | 4.00 (1.1–6.9) | 18.1 (neg) | 30.3 (pos) | 4%–25% | |
| 3 | 2.2 (0.1–4.3) | 0.00 | – | – | |
| 4 | 2.8 (0,4–5.3) | 19.5 | – | – | |
| 5 | 1 | 10.1 (6.9–13.2) | 20.8 (neg) | 48.6 (pos) | 4%–25% |
| 2 | 6.5 (4.0–9.0) | 19.9 (neg) | 37.6 (pos) | 4%–25% | |
| 3 | 5.3 (3.1–7.5) | 0.00 | – | – | |
| 4 | 6.3 (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.