Fig. 3.

Histological sections of ovary and testis from SPF chicks euthanized 7 days after challenge with IBVPR03 (49 days of age—Exp. 1). (A) Intense heterophilic infiltration in the ovary of unvaccinated bird (NONVAC/PR03) and (B) preservation of gonadal structures in the ovary of a vaccinated bird (VAC/PR03). (C) Testicular degeneration, heterophillic, and mononuclear infiltrate in the interstitial space of unvaccinated male (NONVAC/PR03) and (D) preserved seminiferous tubules of a vaccinated male (VAC/PR03). H&E. Bar = 200 μm (A, B) and 100 μm (C, D)