Antibody responses in immunized or challenged piglets
The antibody response in the ELISA showed that all immunized piglets in groups A1 and A2 were seroconverted by 14 dpi (Fig. 4A, Fig. 4B). A total of 3 of 5 piglets in group B1 were seroconverted by 7 dpi, and the remaining piglets seroconverted by 10 dpi (Fig. 4A). Two of five piglets in group B2 were seroconverted by 5 dpi, and the remaining piglets seroconverted by 7 dpi (Fig. 4B). No PRRSV-specific antibodies were detected in the control piglets prior to challenge (Fig. 4A, Fig. 4B). Antibody responses of piglets in groups C1 and C2 were negative throughout the study (Fig. 4A, Fig. 4B).