Fig. 2: gross photographs changes observed in squirrel monkeys (Saimiri spp.) infected by the yellow fever virus (YFV). (A) Ventral back of the abdomen with bleeding points at 7 days post-infection (dpi). (B) Diffuse yellow liver with haemorrhagic spots and subcapsular multifocal petechiae at 7 dpi. (C, D) Heavy bleeding throughout the liver of the animal that succumbed to 6 dpi. (E) Liver diffusely yellowed at 20 dpi. (F) Normal liver. (G) Brain with congestion and haemorrhage. (H) Skull lid with subcutaneous hematoma at 6 dpi (arrow). (I) Normal brain. (J) Marked pulmonary congestion (left). (K, L) Spleen with rounded edges and whitish and/or dark red areas (arrows). (M) Normal spleen. (N) Stomach with contents (blood/digested) in the lumen. (O) Normal stomach. NC: negative control.