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PRV-specific NAb in serum. The seroneutralization assay was performed on a PRV-infected swine kidney cell line. The mean titers, including standard error bars, for each group of pigs are expressed as the highest serum dilution inhibiting the cytopathogenic effect in 50% of PRV-infected PK15 cell line cultures. *, P < 0.05; **, P < 0.01, calculated with the nonparametric Mann-Whitney test; #, no survivor.
