Presence of Porcine Circovirus Type 2 in the Environment of Farm Facilities without Pigs in Long Term-Vaccinated Farrow-to-Wean Farms

1. López-Lorenzo, G.
2. Prieto, A.
3. López-Novo, C.
4. Díaz, P.
5. Remesar, S.
6. Morrondo, P.
7. Fernández, G.
8. Díaz-Cao, J.M.