Table 4.
EU- and US-type PRRSV infections on 20 case herds and 20 PMWS-free herds
| PRRSV infection type |
Case herds |
PMWS control herds |
|---|---|---|
| European (EU) | 6 | 2 |
| American (US) | 0 | 6 |
| EU and US | 12 | 1 |
| No PRRSV | 4 | 11 |
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