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Contagious Ovine Digital Dermatitis (view source)
Revision as of 14:34, 1 August 2011
, 14:34, 1 August 2011no edit summary
==Introduction==
==Introduction==
Contagious Ovine Digital Dermatitis is an apparently new, severe condition causing '''lameness in sheep''', first reported in 1997. The aetiology remains unclear but it is associated with the presence of '''spirochaetes''' similar to those found in bovine digital dermatitis.
Contagious Ovine Digital Dermatitis is an apparently new, severe condition causing '''lameness in sheep''', first reported in 1997. The aetiology remains unclear but it is associated with the presence of [[Category:Spirochaetes|'''spirochaetes''']] similar to those found in bovine digital dermatitis.
Differentiating CODD from classic '''foot rot''' can be difficult in some cases.
Differentiating CODD from classic [[Footrot - Sheep|'''foot rot''']] can be difficult in some cases.
==Clinical signs==
==Clinical Signs==
'''Acute lameness''' is the primary presenting sign, and the affected foot is often carried.
'''Acute lameness''' is the primary presenting sign, and the affected foot is often carried.
The response to conventional treatment can help distinguish between CODD and foot rot, as CODD cases may fail to respond.
The response to conventional treatment can help distinguish between CODD and foot rot, as CODD cases may fail to respond.
'''Microbiological examination''' can be carried out in suitable anaerobic conditions, and failure to demonstrate the organism responsible for footrot ''Dichelobacter nodosus'' might indicate CODD is present. However this is rarely performed.
'''Microbiological examination''' can be carried out in suitable anaerobic conditions, and failure to demonstrate the organism responsible for footrot ''[[Dichelobacter nodosus]]'' might indicate CODD is present. However this is rarely performed.
==Treatment and prevention==
==Treatment==
Conventional antibiotic treatments are usually ineffective in cases of CODD, but it might be worth '''test-treating''' animals with long-acting oxytetracycline and zinc sulphate footbaths before resorting to unlicenced treatments in case it is just a case of virulent foot rot.
Conventional antibiotic treatments are usually ineffective in cases of CODD, but it might be worth '''test-treating''' animals with long-acting oxytetracycline and zinc sulphate footbaths before resorting to unlicenced treatments in case it is just a case of virulent foot rot.
If the feet have been permanently damaged by the disease, '''culling''' might be the best option.
If the feet have been permanently damaged by the disease, '''culling''' might be the best option.
==Prevention==
Effective prevention of the more common reasons for lameness in sheep such as '''[[Contagious Footrot|scald]] and [[Footrot - Sheep|foot rot]]''' may help reduce the incidence of CODD. This includes: pasture management to avoid excessive damp areas, regular footbathing, regular examination of the flock, '''prompt separation and treatment of affected sheep''', culling chronically affected sheep, '''quarantine of replacement stock'''.
{{Learning
|flashcards = [[Sheep Medicine Q&A 02]]
}}
==References==
==References==
Hindson, J., Winter, A. (2002) '''Manual of sheep diseeases''', ''John Wiley and Sons''
Hindson, J., Winter, A. (2002) '''Manual of sheep diseeases''', ''John Wiley and Sons''
[[Category:To Do - Helen]]
[[Category:To Do - Review]]
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[[Category:Dermatological Diseases - Sheep]]
[[Category:Expert Review - Farm Animal]]
[[Category:Integumentary System - Pathology]]