Difference between revisions of "Psoroptes ovis - clinical"

Revision as of 10:53, 9 July 2010

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

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

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-#REDIRECT[[Psoroptic Mange]]
+===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]]
+'''Bold text'''