ArterivirusArterivirus InfectionsArteritis Virus, EquineMacrophagesPorcine respiratory and reproductive syndrome virusNidoviralesArteriviridaeMacrophage ActivationMacrophages, PeritonealLactate dehydrogenase-elevating virusMacrophages, AlveolarPorcine Reproductive and Respiratory SyndromeRNA ReplicaseRNA, ViralCell LineVirus ReplicationOpen Reading FramesViral Nonstructural ProteinsGenome, ViralHorsesCricetinaeMolecular Sequence DataPhagocytosisMacrophage Colony-Stimulating FactorCells, CulturedLipopolysaccharides