<div>S – Sensitive; I – Intermediate; R – Resistant</div><div>Figure 1</div><div>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.</div>