Abstract
A Japanese Black Ox showed pyrexia, anorexia and depression on a farm in Gunma Prefecture in December, 1985. Autopsy revealed hepatic lesions consisting of numerous approximately spherical pale lesions scattered on the surface. Inflammatory lesions were seen in the right lobe of the lung. A part of the trachea was whitish and thickened. Histologically, necrotic foci were observed in most areas of the liver with proliferation of fungi around blood vessels. The pulmonary lesions were seriously exudative. Fungi were also observed in a part of the bronchiole and vascular wall. Mortierella wolfii was isolated from the liver. The appearance of mycelia in the liver was identical.
