Table 7.
Serological profiles of 7306 study animals (cases and controls pooled) at induction for four viruses and estimated pooled weighted seroprevalences across the project populationa,b.
| BoHV-1 | BVDV-1 | BRSV | BPIV-3 | Number of animals | Number of controls | Number of cases | Pooled weightedc % |
|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 99 | 35 | 64 | 1.1 |
| 1 | 0 | 0 | 0 | 10 | 5 | 5 | 0.1 |
| 0 | 1 | 0 | 0 | 64 | 22 | 42 | 0.7 |
| 0 | 0 | 1 | 0 | 193 | 65 | 128 | 2.1 |
| 0 | 0 | 0 | 1 | 268 | 109 | 159 | 3.2 |
| 1 | 1 | 0 | 0 | 7 | 6 | 1 | 0.1 |
| 1 | 0 | 1 | 0 | 20 | 9 | 11 | 0.3 |
| 1 | 0 | 0 | 1 | 54 | 18 | 36 | 0.6 |
| 0 | 1 | 1 | 0 | 253 | 126 | 127 | 3.5 |
| 0 | 1 | 0 | 1 | 325 | 151 | 174 | 4.2 |
| 0 | 0 | 1 | 1 | 1506 | 662 | 844 | 18.9 |
| 1 | 1 | 1 | 0 | 65 | 41 | 24 | 1.0 |
| 1 | 1 | 0 | 1 | 89 | 48 | 41 | 1.3 |
| 1 | 0 | 1 | 1 | 312 | 163 | 149 | 4.4 |
| 0 | 1 | 1 | 1 | 2973 | 1590 | 1383 | 42.6 |
| 1 | 1 | 1 | 1 | 1068 | 605 | 463 | 15.9 |
a
Seronegative at induction was designated 0 and any positive value was designated 1.
b
BoHV-1: bovine herpesvirus 1, BVDV-1: bovine viral diarrhoea virus 1, BRSV: bovine respiratory syncytial virus, BPIV-3: bovine parainfluenza virus 3.
c
Pooled weighted seroprevalences calculated as (0.84 × observed percentage in controls + 0.16 × observed percentage in cases) based on the ratio of the sampling fractions for selection from the NBRDI project population as a case versus as a control (5.3:1).