Table 1.
Percentage (number) of positive results for BVDV2 via qRT-PCR from buffy coat and nasal swab samples for beef calves treated with injectable trace minerals (VAC + ITM; n = 15) or not (VAC + SAL; n = 15) concurrently with MLV-BRD vaccination, or calves neither treated nor vaccinated (UNVAC; n = 15). All calves were individually challenged with BVDV2 strain 890 five days after vaccination and treatment. 1Represents the total number of calves with at least one positive BVDV PCR result in all days out of 15 calves in each group (if a calf tested positive in more than one day, it was counted only once).* Significant difference (P < 0.05).
| Day | Buffy Coat |
Nasal Swabs |
||||
|---|---|---|---|---|---|---|
| VAC + ITM (n = 15) | VAC + SAL (n = 15) | UNVAC (n = 15) | VAC + ITM (n = 15) | VAC + SAL (n = 15) | UNVAC (n = 15) | |
| 0 | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) |
| 5 | 6.7 % (1) | 0 (0) | 33.3 % (5)* | 13.3 % (2) | 13.3 % (2) | 33.3 % (5) |
| 7 | 0 (0) | 6.7 % (1) | 73.4 % (11)* | 13.3 % (2) | 6.7 % (1) | 20 % (3) |
| Cumulativea | 6.7 % (1) | 6.7 % (1) | 93.3 % (14)* | 26.7 % (4) | 13.3 % (2) | 46.7 % (7) |
Represents the total number of calves with at least one positive BVDV PCR result in all days out of 15 calves in each group (if a calf tested positive in more than one day, it was counted only once).