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Psoroptes ovis (view source)

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*Indirect transmission can also occur

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~~'''Pathogenesis'''~~

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*Economically important ectoparasite of sheep

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*Causes '''sheep scab'''

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**Wool loss, restlessness, biting, scratching of infested area and decreased productivity through decreased weight gain

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**Usually seen in '''late autumn''' and '''early winter''' (although may also occur in late summer)

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**Population numbers decline after shearing due to a change in the micro-climate, then build up again as the fleece grows

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**'''Notifiable in UK'''

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*Mites found under scabs and in skin folds

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*Lesions most common on flanks, neck, back and shoulders

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*Causes pruritic condition of cattle

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*Active in keratin layer

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*Mouthparts abrade the skin

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*Antigenic material in mite faeces can lead to hypersensitivity reactions

[[Category:Sheep]][[Category:Cattle]]

[[Category:To_Do_-_Max]]

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