Table 2.
Porcine reproductive and respiratory syndrome virus (PRRSV)-positive proportion (%) in oral fluid and tonsil scraping specimens, average daily weight gain, and mortalities in two production batches of two growing pig farms (Farms 4 and 5).
| PCR positive proportion (%) | ||||||
|---|---|---|---|---|---|---|
| Farm | Barn | Production batch | Oral fluid | Tonsil scraping | Mortality (%) | Average daily weight gain (kg) |
| 4a | 1 | 1 | 10.00 | 50.00 | 19.00 | 1.66 |
| 2 | 60.00 | 50.00 | 8.00 | 1.68 | ||
| 2 | 1 | 0.00 | 55.56 | 12.00 | 1.62 | |
| 2 | 25.00 | 33.33 | 7.00 | 1.84 | ||
| 3 | 1 | 11.11 | 66.67 | 6.00 | 1.68 | |
| 2 | 42.86 | 100.00 | 12.00 | 1.85 | ||
| 4 | 1 | 0.00 | 70.00 | 7.00 | 1.69 | |
| 2 | 57.14 | 83.33 | 10.00 | 1.77 | ||
| 5b | 1 | 1 | 57.14 | 66.67 | 4.09 | 1.90 |
| 2 | 57.14 | 14.29 | 4.68 | 1.87 | ||
| 2 | 1 | 10.00 | 53.85 | 4.36 | 1.82 | |
| 2 | 42.86 | 37.50 | 3.44 | 1.67 | ||
| 3 | 1 | 14.29 | 66.67 | 6.56 | 1.74 | |
| 2 | 16.67 | 25.00 | 3.81 | 1.83 | ||
| 4 | 1 | 0.00 | 87.50 | 5.95 | 1.73 | |
| 2 | 50.00 | 50.00 | 3.47 | 1.80 | ||
a
Farm 4. Latest PRRSV outbreak, <1 month prior to the first sampling event. Production batch 1 occurred April–September 2019 and production batch 2 October 2019–February 2020.
b
Farm 5. Vaccinated with a modified live vaccine (Ingelvac PRRS® MLV, Boehringer Ingelheim). Production batch 1 occurred April–October 2019 and production batch 2 November 2019–March 2020.