Difference between revisions of "Psoroptes ovis - clinical"
Jump to navigation
Jump to search
| Line 1: | Line 1: | ||
| + | |||
| + | ===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=== | ===Diagnosis=== | ||
*Skin scraping | *Skin scraping | ||
| Line 19: | Line 41: | ||
[[Category:To_Do_-_Clinical]] | [[Category:To_Do_-_Clinical]] | ||
| + | '''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