footrot

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footrot

a disease of the foot characterized by dermatitis of the interdigital skin and with some underrunning of the horn, especially at the heel. Infection under the horn is common. Most forms of the disease are infectious and caused by bacteria. Called also pododermatitis.

bovine footrot
Fusobacterium necrophorum subsp. necrophorum (biovar/biotype A) is the more common type isolated and is usually present in pure culture, but F. necrophorum subsp. funduliforme (biovar/biotype B) is also isolated in some cases, usually with other bacterial species. There is severe dermatitis in the cleft of the foot initially and severe lameness. Further spread to deep structures of the foot, requiring amputation of a claw, may occur. Called also foul-in-the-foot, fouls.
ovine footrot
is caused by Dichelobacter nodosus. A highly contagious inflammation of the skin-horn junction followed by underrunning of the horn and inflammation of the sensitive laminae of the foot. Lameness is severe and may affect all four feet. Dichelobacter (Bacteroides) nodosus is the essential causal pathogen. It is a highly specialized organism in the small taxonomic group, the Cardiobacteriaciae. F. necrophorum aids D. nodosus in the invasion of the foot and contributes in the inflammatory reaction. Two other bacteria, Spirochaeta (Treponema) penortha and a motile fusiform bacillus, are commonly present in affected feet but are believed to have no primary etiological importance.
porcine footrot
a noncontagious infection of the sensitive tissues of the foot caused by abrasive wearing of the horn, usually on the lateral aspect of the lateral digit, and the introduction of a mixed infection. There is abscess formation with scanty pus discharging at the coronet. Can cause severe lameness and a permanently deformed claw in some. Common in pigs housed on abrasive floors. A nutritional deficiency of biotin is thought by some to play a predisposing role or at least that provision of the vitamin has a preventive effect. See also foot abscess.
stable footrot
Bacteroides spp. are the probable cause of minor outbreaks of this horn junction dermatitis which occurs in housed cattle. There is a bad odor, underrunning of the horn and a sebaceous exudate. Secondary infection of the deep structures may occur.
strawberry footrot
is a proliferative dermatitis of the skin of the back of the pastern of sheep caused by Dermatophilus congolensis (D. pedis). It does not resemble any of the other footrots. Called also proliferative dermatitis.
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