Figure 2

Weekly detection (LPS ELISA, IDEXX) of Salmonella-specific antibodies (mean S/ P ratio), as a function of time (DPC: days post contact). (■) DIVA vaccine; (●) DIVA vaccine + Coated calcium-butyrate salt; (✖)Positive Control; (✱) Negative Control. DPC = -1: Replacement and oral challenge with 10⁷ CFU/2 mL Salmonella Typhimurium of 2 seeder pigs per group of 8 pigs, with reintroduction of seeders in their original pen 24 h later.