Difference between revisions of "Contagious Footrot"
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| − | + | {| cellpadding="10" cellspacing="0" border="1" | |
| + | | Also known as: | ||
| + | | '''Scald''' | ||
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| + | ==Description== | ||
| + | An economically important disease causing lameness in sheep, is associated with under-running of the hoof and a characteristic 'odour'. Footrot is caused by [[Dichelobacter nodosus|''Dichelobacter nodosus'']] together with [[Fusobacterium|''Fusobacterium necrophorum'']]. | ||
| + | Moisture and trauma allow ''F. necrophorum'' to enter which aids bacterial penetration of the epidermis by ''D. nodosus'' resulting in [[Necrosis - Pathology|necrosis]] and [Inflammation - Introduction|[inflammation]]. | ||
Carrier animals are a major source of infection and are difficult to find as they are often sub clinical cases. | Carrier animals are a major source of infection and are difficult to find as they are often sub clinical cases. | ||
| − | + | ==Signalment== | |
| − | + | Affects sheep, particularly those kept in wet warm conditions. | |
| − | Affects sheep, particularly those kept in wet | ||
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==Diagnosis== | ==Diagnosis== | ||
| − | Can be made on a history of lameness and rapid spread amongst the flock in combination with clinical signs | + | Can be made on a history of lameness and rapid spread amongst the flock in combination with clinical signs. |
| − | + | ==Clinical Signs== | |
| − | + | Lameness is often the first clinical sign to be noted and can vary in severity. Under-running of the horn is present and there is often a necrotic discharge which causes the characteristic foul 'odour'. | |
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==Pathology== | ==Pathology== | ||
Grossly: | Grossly: | ||
| − | Early lesions are red, moist, swollen and interdigital skin is eroded. This spreads to epidermal matrix of the hoof leading to separation of the horn and | + | Early lesions are red, moist, swollen and interdigital skin is eroded. This spreads to epidermal matrix of the hoof leading to separation of the horn and malodorous exudate. |
Regeneration is attempted as germinal epithelium is not destroyed. | Regeneration is attempted as germinal epithelium is not destroyed. | ||
Chronic infections can result in a long misshapen hoof. | Chronic infections can result in a long misshapen hoof. | ||
| − | Benign footrot results in only the interdigital skin being affected and a slight separation of heel horn. Mostly this is the type occuring in cattle. | + | Benign footrot (scald) results in only the interdigital skin being affected and a slight separation of heel horn. Mostly this is the type occuring in cattle. |
==Treatment== | ==Treatment== | ||
| − | A single dose of [[Antibiotics|antibiotics]] ideally | + | A single dose of [[Antibiotics|antibiotics]] ideally penicillin or oxytetracycline gives rapid resolution. |
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| − | + | Foot-bathing is also useful zinc sulphate and formalin can be used. | |
| + | This is more useful as a form of control preventing footrot. | ||
| − | + | ==Prognosis== | |
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==References== | ==References== | ||
| − | + | [[Category:To_Do_-_Caz]] | |
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Revision as of 12:02, 5 August 2010
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This article is still under construction. |
| Also known as: | Scald |
Description
An economically important disease causing lameness in sheep, is associated with under-running of the hoof and a characteristic 'odour'. Footrot is caused by Dichelobacter nodosus together with Fusobacterium necrophorum. Moisture and trauma allow F. necrophorum to enter which aids bacterial penetration of the epidermis by D. nodosus resulting in necrosis and [Inflammation - Introduction|[inflammation]]. Carrier animals are a major source of infection and are difficult to find as they are often sub clinical cases.
Signalment
Affects sheep, particularly those kept in wet warm conditions.
Diagnosis
Can be made on a history of lameness and rapid spread amongst the flock in combination with clinical signs.
Clinical Signs
Lameness is often the first clinical sign to be noted and can vary in severity. Under-running of the horn is present and there is often a necrotic discharge which causes the characteristic foul 'odour'.
Pathology
Grossly: Early lesions are red, moist, swollen and interdigital skin is eroded. This spreads to epidermal matrix of the hoof leading to separation of the horn and malodorous exudate. Regeneration is attempted as germinal epithelium is not destroyed. Chronic infections can result in a long misshapen hoof. Benign footrot (scald) results in only the interdigital skin being affected and a slight separation of heel horn. Mostly this is the type occuring in cattle.
Treatment
A single dose of antibiotics ideally penicillin or oxytetracycline gives rapid resolution.
Foot-bathing is also useful zinc sulphate and formalin can be used. This is more useful as a form of control preventing footrot.