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Antibody responses in 5-day-old piglets (15 piglets in each group) from sows immunized with different inactivated vaccine formulations. Serum samples were collected from 5-day-old piglets before challenge with PEDV strain AH2012/12. PEDV-specific antibody levels (OD values) (A) and neutralizing antibody levels (B) were determined as described in Materials and methods. Data presented are the mean ± SEM of 15 piglets per group
