Medical Definition of mud fever
1: a chapped inflamed condition of the skin of the legs and belly of a horse due to irritation from mud or drying resulting from washing off mud spatters and closely related or identical in nature to grease heel
2: blue comb
3: a mild leptospirosis that occurs chiefly in European agricultural and other workers in wet soil, is caused by infection with a spirochete of the genus Leptospira (L. interrogans) present in native field mice, and is marked by fever and headache without accompanying jaundice
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