Figure 3.

Evaluation of the immune effect of the SHG19-VLP vaccine against vvIBDV. (a) Serum neutralization antibody titers at 13 days post-vaccination. The average values and standard deviations (error bars) from different independent samples are shown; Asterisk sign was used to determine statistical significance among different groups (** p < 0.01); (b) Survival curve. (c) The gross appearance (upper side) and corresponding histopathological appearance (lower side) of the bursal sections (hematoxylin and eosin staining) at 7 days post-challenge.