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Serum antibody responses in vaccinated pregnant sows. Serum samples were collected at 14 and 28 days after the primary immunization to determine the levels of PEDV-N-protein-specific IgG antibodies (A), neutralizing antibodies against PEDV strain AH2012/12 (B), and PEDV-specific IgA antibodies (C). Data are presented as the mean ± SEM of three sows per group
