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Insertion and deletion in a non-essential region of the nonstructural protein 2 (nsp2) of porcine reproductive and respiratory syndrome (PRRS) virus: effects on virulence and immunogenicity

PathogenesisViral PathogenesisImmunologyPathologyVirologyPorcine ReproductivePorcine DiseaseSwine VirusRespiratory SyndromeMedicineAnimal VirusNon-essential Region