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Detection of porcine reproductive and respiratory syndrome virus, porcine circovirus type 2, swine influenza virus and Aujeszky's disease virus in cases of porcine proliferative and necrotizing pneumonia (PNP) in Spain

Swine Influenza VirusPorcine ProliferativeVirus EpidemiologyViral DiagnosticsPathologyVirologyPorcine DiseaseCircovirus Type 2Swine VirusMedicineAnimal Virus