**Perivascular inflammation may be involved especially in horses
**Perivascular inflammation may be involved especially in horses
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===Culicoides hypersensitivity===
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===[[Culicoides Hypersensitivity]]===
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*Usually involves [[Skin Immunologic - Pathology#Type I reactions|Type I reaction]] and [[Skin Immunologic - Pathology#Type IV reactions|Type IV reaction]] due to salivary antigens of ''Culicoides'' sp.
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*May be seasonally recurring or continuous depending on climate