Author, Donkey, Bureaucrats, Administrators
53,803
edits
Changes
Jump to navigation
Jump to search
Created page with '*Adult females are large mites at 750μm in length *Males identified by copulatory suckers and paired posterior lobes *Males attach to deutonymphs (second moult after larval st…'
*Adult females are large mites at 750μm in length
*Males identified by copulatory suckers and paired posterior lobes
*Males attach to deutonymphs (second moult after larval stage) in a process called '''copula'''
**Males remain in copula until females moult for the last time
**Copulation occurs
*Life cycle last '''14 days'''
*Transmitted by direct contact between sheep
*Indirect transmission can also occur
'''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:Sheep]][[Category:Cattle]]
*Males identified by copulatory suckers and paired posterior lobes
*Males attach to deutonymphs (second moult after larval stage) in a process called '''copula'''
**Males remain in copula until females moult for the last time
**Copulation occurs
*Life cycle last '''14 days'''
*Transmitted by direct contact between sheep
*Indirect transmission can also occur
'''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:Sheep]][[Category:Cattle]]