Figure 1. Pathological changes of breeding ducks caused by N-DRV
infection.
(A) The follicles of infected breeding ducks shrank, ovaries bleed, and
fallopian tubes bleed; (B) Bleeding follicles and fallopian tubes of
infected breeding ducks; (C) Swelling and necrosis of spleen of infected
breeding ducks; (D) Infected breeding duck livers were earthy yellow
with bleeding spots on the surface.