Fig. 4
E2-specific antibodies were detected by ELISA only in pigs vaccinated with KNB-E2 before and after challenge. E2- and Erns-specific antibodies were measured by ELISA as we described in Materials and Methods. a E2-specific antibody in serum samples collected after vaccination and challenge. b Erns-specific antibody in serum samples collected at 0 DPC and 15 DPC. Data are shown as mean ± SEM for five pigs per group. * p < 0.05