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***Spongiotic, hyperplastic or exudative superficial perivascular dermatitis
***Spongiotic, hyperplastic or exudative superficial perivascular dermatitis
***Eosinophils[[Category:To_Do_-_Clinical]]
***Eosinophils[[Category:To_Do_-_Clinical]]
===Pathogenesis===
*Economically important ectoparasite of sheep
*Causes '''sheep scab'''
**Wool loss, restlessness, biting, scratching of infested area and decreased productivity through decreased weight gain
**Usually seen in '''late autumn''' and '''early winter''' (although may also occur in late summer)
**Population numbers decline after shearing due to a change in the micro-climate, then build up again as the fleece grows
**'''Notifiable in UK'''
*Mites found under scabs and in skin folds
*Lesions most common on flanks, neck, back and shoulders
*Causes pruritic condition of cattle
*Active in keratin layer
*Mouthparts abrade the skin
*Antigenic material in mite faeces can lead to hypersensitivity reactions
===Diagnosis===
*Skin scraping
*KOH added
*Warm slide over a bunsen flame
*Examine under a microscope
===Treatment===
*Sheep
**Plunge dipping; no less than 1 minute and must dip head at lease once
**Can treat with avermectins or milbemycins by injection
*Cattle, horses and rabbits
**No licensed product for horses in the UK
**Cattle and rabbits can be treated with avermectins, milbemycins or topical acaricides
[[Category:To_Do_-_Clinical]]