Fig. 6.

Antibody responses against PEDV from serum samples. Pigs were vaccinated at 0 days post vaccination (dpv) and then challenged orally with 4 mL of 100 TCID₅₀ of cell culture-adapted CH/HNPJ/2017 P4 at 21 dpv. Serum samples were collected at 0, 7, 14 and 21 dpv. (A) Antibody responses against PEDV from serum samples from pigs using IgG-specific ELISA before challenge exposure. At each serum collection time point, the number of IgG-specific antibody positive pigs for experimental vaccine group experimental vaccine, commercial vaccine and mock control group as following: at 0 dpv, all three of group are 0/5; at 7 dpv, three of group are respectively 3/5, 0/5 and 0/5; at 14 dpv, three of group are respectively 4/5, 2/5 and 0/5; at 21 dpv, three of group are respectively 5/5, 5/5 and 0/5; The asterisk means significant difference (P < 0.05). (B) Antibody responses against PEDV from serum samples from pigs using the SN test before challenge exposure.