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Pathology of Aujeszky's Disease in Mink

Lesions in 21 mink which died of Aujeszky's disease included hemorrhages in lungs, heart, mediastinum, thymus, diaphragm, gastric wall, pancreas, and enteric wall. Microscopically, hyalin and fibrinoid degeneration and necrosis of vessel walls were present in cardiac muscle, brain, gastrointestinal wall and occasionally elsewhere in the body. Hemorrhages, exudation of plasma proteins and necrosis were associated with the angiopathy. Inflammation was minimal or absent. Other findings were congestion and extravasation of blood (lungs, liver), necrosis of lymphoid cells, and hemoglobinuric nephrosis. Aujeszky's disease virus was isolated from all but three animals. After experimental infection of three mink, similar though less pronounced lesions were found to those observed in the field cases.