ArterivirusArteritis Virus, EquineArterivirus InfectionsPorcine respiratory and reproductive syndrome virusNidoviralesArteriviridaeLactate dehydrogenase-elevating virusRNA, ViralRNA ReplicasePorcine Reproductive and Respiratory SyndromeMolecular Sequence DataGenome, ViralCell LineViral Nonstructural ProteinsBase Sequence