Table 3.
Specific IgG titres on day of vaccination and day of challenge
| Group | PI3V | BRSV | ||||
| Animal | D0 (vaccination) | D92 (challenge) | Animal | D0 (vaccination) | D84 (challenge) | |
| Control MDA+ | 632181 | 2 | 1 | 641479 | 4 | <2 |
| 643429 | 1024 | 1 | 643771 | 4 | <2 | |
| 643433 | 1024 | 1 | 643774 | 16 | <2 | |
| 689106 | 128 | 1 | 643778 | 8 | <2 | |
| 689109 | 256 | 1 | 643781 | 4 | <2 | |
| 643424 | 1024 | 512* | – | – | – | |
| 643427 | 256 | 8* | – | – | – | |
| 643432 | 512 | 64* | – | – | – | |
| Mean | 235 | 1 | Mean | 6 | <2 | |
| Vaccinated MDA− | 637676 | 1 | 128 | 641480 | <2 | 2 |
| 643435 | 1 | 512 | 643765 | <2 | 4 | |
| 643436 | 1 | 32 | 643766 | <2 | 4 | |
| 643437 | 1 | 128 | 643767 | <2 | 8 | |
| 643439 | 1 | 16 | 643768 | <2 | 4 | |
| 643440 | 1 | 16 | – | – | – | |
| Mean | 1 | 64 | Mean | <2 | 4 | |
| Vaccinated MDA+ | 643425 | 512 | 128 | 643769 | 8 | 8 |
| 643426 | 256 | 64 | 643770 | 8 | 4 | |
| 643428 | 1024 | 64 | 643772 | 2 | 4 | |
| 643430 | 128 | 32 | 643773 | 8 | 8 | |
| 643431 | 256 | 32 | 643780 | 16 | 2 | |
| 689108 | 32 | † | – | – | – | |
| 689107 | 128 | 8 | – | – | – | |
| Mean | 210 | 40 | Mean | 7 | 5 | |
*Still seropositive, excluded from challenge.
†Died on day 7 from sepsis following omphalitis.
BRSV, bovine respiratory syncytial virus; MDA, maternally derived antibodies; PI3V, parainfluenza type 3 virus.