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Virus titers in sera of the challenged piglets at 0, 7, 14, and 21 days post challenge (DPC) (A–D). Data were shown as means ± standard error (error bars). Asterisk indicates significant differences between vaccinated groups and Dulbecco’s Modified Eagle Media (DMEM) group (* p < 0.05; *** p < 0.001, ns means no significant differences).
