Difference between revisions of "Contagious Footrot"

Revision as of 11:22, 5 August 2010

Description

A mild condition affecting sheep causing lameness. The disease is associated with under-running of the hoof and a typical 'odour'. Footrot is caused by Dichelobacter nodosus together with Fusobacterium necrophorum. Moisture and trauma allowF. necrophorum to enter which aids bacterial penetration of the epidermis by D. nodosus invades resulting in necrosis and inflammation. It is an economically important disease.

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)- only interdigital skin affected, slight separation of heel horn
  - Mostly the type occuring in cattle

@@ Line 1: / Line 1: @@
 ==Description==
-**Usually caused by [[Bacteroides|''Bacteroides nodosus'']] together with [[Fusobacterium|''Fusobacterium necrophorum'']]
+A mild condition affecting sheep causing lameness. The disease is associated with under-running of the hoof and a typical 'odour'. Footrot is caused by [[Dichelobacter nodosus|''Dichelobacter nodosus'']] together with [[Fusobacterium|''Fusobacterium necrophorum'']].
-**Moisture and trauma allow Dichelobacter nodosus to enter -> aids bacterial penetration of epidermis -> ''F. necrophorum'' invades -> necrosis and inflammation.
+Moisture and trauma allow''F. necrophorum'' to enter which aids bacterial penetration of the epidermis by ''D. nodosus'' invades resulting in necrosis and inflammation.
-**Contagious, economically important disease
+It is an economically important disease.
-**Wet pasture and hydrated stratum corneum leads to colonisation by Gram positive cocci and [[Arcanobacter pyogenes|''Arcanobacter pyogenes'']], followed by ''F. necrophorum''; addition of ''D. nodosus'' causes footrot
-**Can lead to loss of hoof
 ==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:
+Grossly:
-***Early lesions - red, moist, swollen, eroded interdigital skin
+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.
-***Spreads to epidermal matrix of hoof -> separation of horn + malodorous exudate
+Regeneration is attempted as germinal epithelium is not destroyed.
-***Regeneration attempted as germinal epithelium is not destroyed
+Chronic infections can result in a long misshapen hoof.
-***Chronic infections -> long , misshapen hoof
+**Benign footrot (scald)- only interdigital skin affected, slight separation of heel horn
-**Benign footrot (scald)- only interdigital ski affected, slight separation of heel horn
 ***Mostly the type occuring in cattle
 [[Category:To_Do_-_Caz]]