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The concentrations of TNF-α (A), IFN-γ (B), and IL-4 (C) in serum obtained from test mice. At 76 h post-PRV infection, three mice from each group were randomly selected for the collection of blood, which was used to determine the levels of three cytokines in mouse serum (****P < 0.0001, ***P < 0.001, **P < 0.01, *P < 0.05, ns: P > 0.05).
