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====Dermatophilosis====
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====[[Dermatophilosis]]====
[[Image: Dermatophilosis in cow.jpg|100px|thumb|right|<small><center>Dermatophilosis in a cow (Courtesy of Bristol BioMed Image Archive)</center></small>]]
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*Caused by [[Dermatophilus congolensis|''Dermatophilus congolensis'']]
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*Affects cattle, horses, sheep mainly
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*More common in wet and warm weather
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*Transmotted from animal to animal
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*Lesions tend to form on dorsal back and extremities
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*Associated with skin trauma, prolonged wetting or [[Parasitic skin infections - Pathology#Parasitic| parasites]]
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** -> penetration of zoospores
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*Bacteria proliferate in outer sheath of hair follicles and superficial epidermis
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*Gram-positive, filamentous branching organisms, subdivided longitudinally and transversly
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*Causing:
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**Acute inflammatory response -> neutrophil migration through dermis and epidermis -> formation of microabscesses
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**Further penetration of bacteria is thus prevented
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**Regenerated epidermis is invaded again by remaining organisms
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**Repeated reinfection -> multilaminated pustular crusts
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*Grossly:
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**[[Skin Glossary - Pathology|Papules, pustules, crusts]] may coalesce and mat the coat
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*Microscopically:
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**Hyperplastic superficial perivascular dermatitis
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**Multilaminated crusts, alternating keratin and inflammatory cell layers
      
====[[Greasy pig disease]]====
 
====[[Greasy pig disease]]====
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