A Single Mutation of VP2 is Responsible for the Lethality and Antigenicity Differences between Novel Variant and Very Virulent IBDV Strains

Figure 3

Histopathological examination of the bursa, spleen, and thymus tissues of chickens infected with rHLJ0504, rHLJ-D279N, rSHG-N279D, or rSHG19 at 5 dpi.