ArterivirusArteritis Virus, EquineArterivirus InfectionsPorcine respiratory and reproductive syndrome virusNidoviralesArteriviridaeLactate dehydrogenase-elevating virusPorcine Reproductive and Respiratory SyndromeRNA ReplicaseRNA, ViralOpen Reading FramesViral Nonstructural ProteinsVirus ReplicationGenome, ViralHorsesCricetinaeMolecular Sequence Data