S – Sensitive; I – Intermediate; R – Resistant
Figure 1
Pathological and histopathological findings. (a) Cyanosis of the skin of the nose, ears and ventral neck of a dead piglet. The skin on the tip of the ear is dry and dark purple with sloughed portions. (b) Enlarged dark purple mesenteric lymph nodes (arrows), enlarged spleen (splenomegaly) and moderately enlarged liver (hepatomegaly) were observed in most piglets necropsied. Inset: Magnification of the right hepatic lobe displaying scattered small white spots in the parenchyma (foci of parenchymal necrosis). (c) Colonic mucosa covered with multifocal adherent gray-yellow fibrinous membranes was observed in some necropsied piglets. (d) Hyperemia of liver, sinusoids infiltrated by erythrocytes, interstitial infiltration with mononuclear cell and foci of necrosis (arrow) or hemorrhage were present in liver tissue of dead piglets, haematoxylin and eosin x220.