Systematic Veterinary Virology

ACUTE FORM

• Peracute infection: No gross lesions.
• Acute infection: Acute infection is characterised by following lesions:
• Haemorrhages and purplish discoloration of the skin.
• Necrotic foci in the tonsils.
• Swollen and oedematous submandibular and pharyngeal lymphnodes with peripheral haemorrhages.
• Spleen with raised edges and dark wedge shaped areas.
• Pinpoint to ecchymotic hemorrhages on the surface of the kidneys (turkey egg appearance). The haemorrhages are most marked under the kidney capsule.
• Hemorrhages on the surface of the small and large intestine, larynx, heart, epiglottis, and the fascia lata of the back muscles.
• Accumulation of straw-colored fluids in the peritoneal and thoracic cavities and in the pericardial sac.
• Congestion of the lung and bronchopneumonia.
• In brain the lesions are perivascular cuffing, endothelial proliferation, and microgliosis.