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Parasitic skin infections - Pathology (view source)

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===[[Hookworm Dermatosis]]===

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===Onchocerciasis===

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===[[Onchocerciasis]]===

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*Caused by [[Onchocerca spp.|''Onchocerca'' spp.]]

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*Affects horses, cattle, [[Onchocerciasis - Donkey|donkeys]], mules, sheep, goats

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*Transmitted by [[Insecta|Simulidae and Ceratopogonidae]]

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*Hypersensitivity varies with individuals, may occur without any inflammation

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*Grossly:

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**Adult parasites within connective tissue nodules

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**Microfilaria in dermis, especially ventral midline

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**Patchy alopecia, erythema, scaling, crusting, change in pigmentation

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**Circular areas of dermatitis on forehead appears in some horses

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**May also involve keratitis, uveitis and conjunctivitis

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*Microscopically:

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**Normal to superficial to deep perivascular dermatitis

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**Eosinophils, lymphocytes, microfilariae

===Stephanofilariasis===

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**Eosinophils, adult and microfilarial parasites

**[[Skin Glossary - Pathology|Epidermal hyperkeratosis, parakeratosis, acanthosis]], eosinophilic microabscesses and crusts

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==Lice==

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