Lesions
In the case of peracute or acute forms of the disease, the post-mortem findings are dominated by general septicaemic lesions including vascular disturbances, as reflected by general passive hyperaemia and congestion thoughout the carcass. Petechial and ecchymotic haemorrhages are often present in the abdominal and coronary fat, and haemorrhages may be observed in the intestinal mucosae and on subserosa! surfaces in the thoracic and abdominal cavities. The liver and spleen are often swollen and may contain multiple small focal areas of coagulative necrosis or the organs may undergo more generalised necrosis. The lungs are often involved, especially in turkeys, where the lesions may be very characteristic. In the most acute forms of infection, the lung lesions are dominated