ArterivirusArteritis Virus, EquineArterivirus InfectionsPorcine respiratory and reproductive syndrome virusPorcine Reproductive and Respiratory SyndromeNidoviralesArteriviridaeLactate dehydrogenase-elevating virusSwineRNA ReplicaseRNA, ViralOpen Reading FramesViral Nonstructural ProteinsGenome, ViralVirus ReplicationHorsesCricetinaeMolecular Sequence DataCell Line