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Digital dermatitis first discovered in Italy in 1974 by Cheli and Mortellaro. This disease is caused by the bacteria from the genus Treponema and the Spirochete family. Digital dermatitis is different from foot rot in cattle and both conditions may occur concurrently. Digital dermatitis primarily affects dairy cattle and has been known to lower the quantity of milk produced, but the quality of the milk is unaffected. Evidence show that risk factors favouring digital dermatitis outbreaks include: poor hygiene and high humidity; introduction of infected animals; no hoof care for heifers and dry cows; high levels of chronically infected animals; insufficient or inadequate hoof trimming; soft hooves and unbalanced nutrition. ==Clinical signs and diagnosis== Digital dermatitis appears as lesions which initially looks like raw, red, oval ulcer on the back of the heel. These lesions develop raised, hair-like projections or wart-like lesions, and some may extend up between the claws or appear on the front of the foot.〔http://www.producer.com/2014/08/digital-dermatitis-emerges-in-beef-cattle/〕 A scoring system〔http://www.hoofhealth.ca/Dopfer.pdf〕 was developed to classify the different stages of digital dermatitis, the M-stages system, where "M" stands for Mortellaro. The different stages are described as: M0, healthy skin; M1, early stage, skin defect < 2 cm diameter; M2, acute active ulcerative lesion; M3, healing stage, lesion covered with scab-like material; M4, chronic stage, that may be dyskeratotic (mostly thickened epithelium) or proliferative or both. Diagnosis is principally based on history and clinical signs. It is very rare that attempts are made to isolate the bacteria.〔(Interdigital Dermatitis - Cattle ) reviewed and published by WikiVet, accessed 11 October 2011.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Digital dermatitis」の詳細全文を読む スポンサード リンク
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