Fig. 1. Gross lesions of the chorioallantoic membrane (CAM) and liver in chicken embryos following inoculation with fowl adenovirus (FAdV) isolate, UPM1137. (A) CAM of control embryo with a thin and transparent membrane. (B) Normal liver in a control embryo without significant findings. (C) Gross lesions of CAM with thickening and cloudiness in a FAdV-adapted embryo at day 10 post-inoculation (pi) in passage 7 (E7). (D) Diffuse necrosis and petechial hemorrhages of liver (arrow) in a congested embryo at day 10 pi in E7.