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Introduction:Viral infection is often accompanied by alteration of the intracellular redox state.Reactive oxygen species (ROS) have been shown to function as cellular signaling molecules,influencing a variety of molecular and biochemical processes,such as NF-kappa B.The aim of the present study was to investigate the interaction between reactive oxygen species (ROS) and NF-kappa B during PRRSV infection.Methods:In this study MARC-145 cells were infected with a novel PRRSV isolate from the Yunnan Provence in southwest China (YN-2011,GenBank accession no.JX 857698).