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| Years | Sample numbers | PRV-gB-positive numbers | SPR |
|---|---|---|---|
| 2015 | 958 | 837 | 87.4% |
| 2016 | 1,564 | 1,453 | 92.9% |
| 2017 | 1,263 | 1,184 | 93.7% |
| 2018 | 249 | 218 | 87.6% |
| Total | 4,034 | 3,692 | 91.5% |
SPR = sero-prevalence rate, PRV-gB = pseudorabies virus glycoprotein B.
