black·leg 'blak-.leg, -.lāg n an enzootic usu. fatal toxemia esp. of young cattle caused by toxins produced by an anaerobic soil bacterium of the genus Clostridium (C. chauvoei syn. C. feseri) called also black quarter, quarter evil, quarter ill, symptomatic anthrax compare BLACK DISEASE, MALIGNANT EDEMA

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black·leg (blakґleg) an acute anaerobic bacterial disease of cattle and sheep caused by Clostridium chauvoei; symptoms include crepitant swelling in the musculature and a high fever, often leading to death within a day. Called also symptomatic anthrax, blackquarter, and quarter evil or ill. Spelled also black leg.

Medical dictionary. 2011.

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