Fig. 4

Histopathology and immunochemistry panel of lung, spleen, and bursa of vaccinated and mock-vaccinated chickens at 3 dpc. a H&E and IHC staining in the lungs of chickens that were vaccinated or mock-vaccinated as indicated. b H&E and IHC staining in the bursa of birds that were vaccinated or mock-vaccinated as indicated. c H&E and IHC staining in the spleens of birds that were vaccinated or mock-vaccinated as indicated