Difference between revisions of "Psoroptes ovis - clinical"

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#REDIRECT[[Psoroptic Mange]]
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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
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===Diagnosis===
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*Skin scraping
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*KOH added
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*Warm slide over a bunsen flame
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*Examine under a microscope
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===Treatment===
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*Sheep
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**Plunge dipping; no less than 1 minute and must dip head at lease once
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**Can treat with avermectins or milbemycins by injection
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*Cattle, horses and rabbits
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**No licensed product for horses in the UK
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**Cattle and rabbits can be treated with avermectins, milbemycins or topical acaricides
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[[Category:To_Do_-_Clinical]]
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'''Bold text'''

Revision as of 10:53, 9 July 2010

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

Bold text