Table 2 Contingency table of PRRSV vaccine use and PRRSV infection status in pig farms
Whether to use PRRSV vaccine \ Number of months with different PRRSV infection statuses | PRRSV provisional negative | PRRSV-positive stable | PRRSV-positive unstable | Total |
|---|---|---|---|---|
No | 131 | 209 | 280 | 620 |
Yes | 0 | 89 | 45 | 134 |
Total | 131 (17.37%) | 298 (39.52%) | 325 (43.11%) | 754 |