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T-cell immune responses against the BVDV in vivo. Percentage of (A) CD4+ IFN-γ+ T cells and (B) CD8+ IFN-γ+ T cells after stimulation in bovine peripheral blood mononuclear cells. n = 5, * p < 0.05, ** p < 0.01, *** p < 0.001, and **** p < 0.0001.
