Table 3.
Presence of PRRSv-specific maternally-derived antibodies (MDAs) in piglets born from PRRSv-vaccinated seropositive sows and PRRSv-vaccinated seronegative sows in two Belgian farrow-to-finish herds. Sows were analyzed at 1 week post-farrowing (1 wpf) using IDEXX ELISA (ELISA 1), CIVTEST ELISA (ELISA 2) and virus neutralization assay (VN). Piglets were analyzed at 3 weeks of age (herd 1) or 4 weeks of age (herd 2) using ELISA 1, ELISA 2 and VN. Piglet values are shown as mean ± standard deviation.
| Sow Number (Parity) | S/p ELISA 1 (1 wpf) | IRPC ELISA 2 (1 wpf) | Log2 VN Titer (1 wpf) | S/p ELISA 1 Piglets | IRPC ELISA 2 Piglets | Log2 VN Titer Piglets |
|---|---|---|---|---|---|---|
| Herd 1 | ||||||
| Sow 1 (7) | 0.19 | 5.84 | 0 | 0.13 ± 0.02 | 1.81 ± 1.36 | 0.70 ± 0.61 |
| Sow 2 (4) | 0.30 | 15.56 | 2 | 0.13 ± 0.03 | 12.67 ± 5.60 | 0.91 ± 0.30 |
| Sow 3 (7) | 0.44 | 17.45 | 2 | 0.28 ± 0.08 | 12.63 ± 9.73 | 0.20 ± 0.50 |
| Sow 4 (5) | 0.63 | 20.10 | 0 | 0.32 ± 0.04 | 13.95 ± 4.62 | 0.33 ± 0.73 |
| Sow 5 (1) | 0.15 | 19.86 | 0 | 0.06 ± 0.03 | 9.66 ± 5.68 | 0.00 ± 0.00 |
| Sow 6 (6) | 1.96 | 100.85 | 4.58 | 1.48 ± 0.21 | 73.33 ± 14.68 | 2.49 ± 0.77 |
| Sow 7 (5) | 2.00 | 123.99 | 4.58 | 1.46 ± 0.26 | 85.24 ± 30.89 | 2.08 ± 1.05 |
| Sow 8 (1) | 1.08 | 94.21 | 0 | 1.04 ± 0.19 | 66.62 ± 19.93 | 0.10 ± 0.32 |
| Herd 2 | ||||||
| Sow 1 (5) | 0.14 | 5.96 | 2 | 0.01 ± 0.01 | 0.39 ± 0.52 | 0.00 ± 0.00 |
| Sow 2 (3) | 0.37 | 13.12 | 1.58 | 0.03 ± 0.04 | 1.07 ± 1.17 | 0.63 ± 0.87 |
| Sow 3 (3) | 0.27 | 7.50 | 2.58 | 0.04 ± 0.03 | 1.65 ± 1.20 | 0.00 ± 0.00 |
| Sow 4 (4) | 1.47 | 65.04 | 1.58 | 0.93 ± 0.1 | 37.27 ± 6.46 | 0.13 ± 0.35 |
| Sow 5 (3) | 1.71 | 89.25 | 2 | 0.78 ± 0.11 | 38.84 ± 13.60 | 0.00 ± 0.00 |
| Sow 6 (3) | 1.41 | 54.30 | 2.58 | 0.54 ± 0.12 | 10.50 ± 4.40 | 0.38 ± 0.52 |
| Sow 7 (1) | 2.01 | 120.24 | 4.58 | 0.89 ± 0.34 | 41.89 ± 16.39 | 1.99 ± 1.00 |
| Sow 8 (1) | 1.87 | 85.11 | 1.58 | 0.87 ± 0.21 | 35.75 ± 16.15 | 0.68 ± 0.74 |