Mucor Mycosis
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Caused by a fungus of the Mucoracae family. Causes a granulomatous rumenitis in cattle with sheets of macrophages and giant cells vvisble on histopathology. Grossly the rumen is thickened and fibrosed and may become ulcerated.
The infection may penetrate the rumen wall leading to a peritonitis. It may also enter blood vessels leading to a thrombosis, infarction and further damage to the vessel wall.
Fungal hyphae are identified histologically with the stain PAS (Periodic acid Schiff) where they stain as purple/red rod like structures.