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IFN-α levels in sera of CSFV-infected animals during the first 2 weeks postinfection. IFN-α levels were determined at 1 and 2 weeks postinfection in group 1 (vPdR-36U inoculated) and group 2 (vPdR-5U inoculated). The asterisk indicates a statistically significant difference between group 1 and group 2 at 2 weeks postinfection (P < 0.001).
