Immunisation of pigs with a major envelope protein sub-unit vaccine against porcine reproductive and respiratory syndrome virus (PRRSV) results in enhanced clinical disease following experimental challenge

1. Prieto, C.
2. Martínez-Lobo, F.J.
3. Díez-Fuertes, F.
4. Aguilar-Calvo, P.
5. Simarro, I.
6. Castro, J.M.