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Parasitic skin infections - Pathology (view source)
Revision as of 21:59, 6 April 2010
, 21:59, 6 April 2010no edit summary
===Cheyletiellosis===
===Cheyletiellosis===
*Caused by ''Cheyletiella'' sp.]]
*Caused by [[Cheyletiella spp.''Cheyletiella'' sp.]]
*Occurs in dogs, cats, rabbits, humans and wild animals
*Occurs in dogs, cats, rabbits, humans and wild animals
*In dogs and cats: hyperkeratosis - dry, white, scaly dandruff along back
*In dogs and cats: hyperkeratosis - dry, white, scaly dandruff along back
*Host-specific
*Host-specific
*In cattle, horses, goats
*In cattle, horses, goats
*Caused by [[Suborder: Astigmata, astigmatid mites|''Chorioptes'' spp.]]
*Caused by [[Chorioptes bovis|''Chorioptes'' spp.]]
*Grossly:
*Grossly:
**Erythematous, papular, crusty lesions
**Erythematous, papular, crusty lesions
===Demodicosis===
===Demodicosis===
*[[Suborder: Astigmata, astigmatid mites|''Demodex'']] are normal inhabitants of hair follicles and sebaceous glands
*[[Demodex|''Demodex'']] are normal inhabitants of hair follicles and sebaceous glands
*Have to have increased number of immature mites to classify as infestation
*Have to have increased number of immature mites to classify as infestation
*Host-specific
*Host-specific
===Notoedric mites===
===Notoedric mites===
*Rare but very contagious
*Rare but very contagious
*Caused by [[Suborder: Astigmata, astigmatid mites|''Notoedres cati'']]
*Caused by [[Notoedres|''Notoedres cati'']]
*Grossly:
*Grossly:
**Erythematous papular rash -> scales, crusts, alopecia -> lichenification when chronic
**Erythematous papular rash -> scales, crusts, alopecia -> lichenification when chronic
===Otodectic mites===
===Otodectic mites===
*Caused by [[Suborder: Astigmata, astigmatid mites|''Otodectes cynotis'']]
*Caused by [[Otodectes cynotis|''Otodectes cynotis'']]
*In external ear canals of carnivores, occasionally elsewhere
*In external ear canals of carnivores, occasionally elsewhere
*Occurs in cattle, sheep, horses, goats, rabbits and other animals
*Occurs in cattle, sheep, horses, goats, rabbits and other animals
*Host-specific
*Host-specific
*[[Suborder: Astigmata, astigmatid mites#Psoroptes cuniculi|''Psoroptes cuniculi'']] in ear canals of rabbits, horses, goats and sheep
*[[Psoroptes cuniculi|''Psoroptes cuniculi'']] in ear canals of rabbits, horses, goats and sheep
*[[Suborder: Astigmata, astigmatid mites|''P.equi'']] at base of mane, ttail and forelock in horses
*[[Psoroptes|''P.equi'']] at base of mane, tail and forelock in horses
*[[Suborder: Astigmata, astigmatid mites|''P.ovis'']] in sheep ('''sheep scab''')and cattle
*[[Psoroptes ovis|''P.ovis'']] in sheep ('''sheep scab''')and cattle
**Thickened skin and dry scales and crusts
**Thickened skin and dry scales and crusts
**Starts at withers and spreads due to self trauma
**Starts at withers and spreads due to self trauma
===Scabies===
===Scabies===
*Caused by [[Suborder: Astigmata, astigmatid mites|''Sarcoptes scabiei'']]
*Caused by [[Sarcoptes|''Sarcoptes scabiei'']]
*Highly contagious
*Highly contagious
*Mainly in pigs, dogs, also horses, cattle, sheep, goats and cats
*Mainly in pigs, dogs, also horses, cattle, sheep, goats and cats
===Trombiculidiasis===
===Trombiculidiasis===
*Harvest mite infestation (chiggers) - [[Suborder: Astigmata, astigmatid mites|''Trombicula'' sp.]]
*Harvest mite infestation (chiggers) - [[Trombicula autumnalis|''Trombicula'' sp.]]
*Form tunnels in epidermis by injecting saliva - eat digested tissue fluid
*Form tunnels in epidermis by injecting saliva - eat digested tissue fluid
*Intense pruritus
*Intense pruritus