Figure 6.

In vivo pathogenicity of PRV-GD and PRV-JM isolates in piglets. (A), Rectal temperature of the challenged piglets during the observation. (B), The changes of weight of the experimental piglets under the same raised conditions from pre-infection to death. (C), Survival rates of piglets infected with PRV-GD or PRV-JM isolates. (D), The tissue pathological changes of piglets. (E–G), Detection of the protein level of IFN-α, IFN-β and IL-1β in serum from piglets challenged by PRV-GD or PRV-JM. (H), Detection of the PRV genomic copy number in blood after infection for 0 days, 2 days and 5 days.