Fig. 4.
The levels of PDCoV-specific IgG and virus-neutralizing (VN) antibodies in pigs. Pigs were vaccinated at 0 days postvaccination (dpv) and were given two booster immunization at 14 and 28 dpv, respectively. Subsequently, the pigs were challenged orally with 3 mL of 1000 PDD50 cell culture-adapted CH/XJYN/2016 P6 at 42 dpv. Serum samples were collected at 0, 7, 14, 21, 28, 35 and 42 dpv, respectively. (a) The levels of PDCoV-specific IgG antibodies in vaccinated pigs; (b) The levels of PDCoV-specific VN antibodies in vaccinated pigs.