Difference between revisions of "Dermatophilosis"
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| + | ==Description== | ||
| + | A group of diseases caused by ''Dermatophilus'' species.Causes a range of conditions in large animals includin rain scald in horses and strawberry foot rot in sheep. | ||
==Signalment== | ==Signalment== | ||
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==Diagnosis== | ==Diagnosis== | ||
| − | + | ==Clinical signs== | |
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| − | + | *Caused by [[Dermatophilus congolensis]] | |
| − | + | **Disease most prevalent in young animals | |
| + | **Damage to the skin predisposes to infection; blood-sucking insects also thought to be involved in transmission | ||
| + | **Lesions after heavy rainfall predominantly affect dorsum of farm animals | ||
| + | **Papules, serous, exudative matting of hair, raised crusty scabs | ||
| + | **Scab formation more prominent in sheep and cattle than in horses | ||
| + | **Lesions may resolve within weeks if dry weather, or may progress | ||
| + | *'''Treatment''': | ||
| + | **Parenteral antibiotics e.g oxytetracycline, pr penicillin-streptomycin combinations | ||
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| + | [[Image: Dermatophilosis in cow.jpg|100px|thumb|right|<small><center>Dermatophilosis in a cow (Courtesy of Bristol BioMed Image Archive)</center></small>]] | ||
| − | + | *Caused by [[Dermatophilus congolensis|''Dermatophilus congolensis'']] | |
| + | *Affects cattle, horses, sheep mainly | ||
| + | *More common in wet and warm weather | ||
| + | *Transmotted from animal to animal | ||
| + | *Lesions tend to form on dorsal back and extremities | ||
| + | *Associated with skin trauma, prolonged wetting or [[Parasitic skin infections - Pathology#Parasitic| parasites]] | ||
| + | ** -> penetration of zoospores | ||
| + | *Bacteria proliferate in outer sheath of hair follicles and superficial epidermis | ||
| + | *Gram-positive, filamentous branching organisms, subdivided longitudinally and transversly | ||
| + | *Causing: | ||
| + | **Acute inflammatory response -> neutrophil migration through dermis and epidermis -> formation of microabscesses | ||
| + | **Further penetration of bacteria is thus prevented | ||
| + | **Regenerated epidermis is invaded again by remaining organisms | ||
| + | **Repeated reinfection -> multilaminated pustular crusts | ||
| + | *Grossly: | ||
| + | **[[Skin Glossary - Pathology|Papules, pustules, crusts]] may coalesce and mat the coat | ||
| + | *Microscopically: | ||
| + | **Hyperplastic superficial perivascular dermatitis | ||
| + | **Multilaminated crusts, alternating keratin and inflammatory cell layers | ||
| − | + | [[Category:Cattle]][[Category:Sheep]][[Category:Horse]][[Category:To_Do_-_Caz]] | |
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Revision as of 14:23, 25 July 2010
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This article is still under construction. |
Description
A group of diseases caused by Dermatophilus species.Causes a range of conditions in large animals includin rain scald in horses and strawberry foot rot in sheep.
Signalment
Diagnosis
Clinical signs
- Caused by Dermatophilus congolensis
- Disease most prevalent in young animals
- Damage to the skin predisposes to infection; blood-sucking insects also thought to be involved in transmission
- Lesions after heavy rainfall predominantly affect dorsum of farm animals
- Papules, serous, exudative matting of hair, raised crusty scabs
- Scab formation more prominent in sheep and cattle than in horses
- Lesions may resolve within weeks if dry weather, or may progress
- Treatment:
- Parenteral antibiotics e.g oxytetracycline, pr penicillin-streptomycin combinations
- Caused by Dermatophilus congolensis
- Affects cattle, horses, sheep mainly
- More common in wet and warm weather
- Transmotted from animal to animal
- Lesions tend to form on dorsal back and extremities
- Associated with skin trauma, prolonged wetting or parasites
- -> penetration of zoospores
- Bacteria proliferate in outer sheath of hair follicles and superficial epidermis
- Gram-positive, filamentous branching organisms, subdivided longitudinally and transversly
- Causing:
- Acute inflammatory response -> neutrophil migration through dermis and epidermis -> formation of microabscesses
- Further penetration of bacteria is thus prevented
- Regenerated epidermis is invaded again by remaining organisms
- Repeated reinfection -> multilaminated pustular crusts
- Grossly:
- Papules, pustules, crusts may coalesce and mat the coat
- Microscopically:
- Hyperplastic superficial perivascular dermatitis
- Multilaminated crusts, alternating keratin and inflammatory cell layers