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[[Image:Malassezia pachydermidis.jpg|thumb|right|150px|''Malassezia pachydermidis'' - Copyright Professor Andrew N. Rycroft, BSc, PHD, C. Biol.F.I.Biol., FRCPath]]
 
[[Image:Malassezia pachydermidis.jpg|thumb|right|150px|''Malassezia pachydermidis'' - Copyright Professor Andrew N. Rycroft, BSc, PHD, C. Biol.F.I.Biol., FRCPath]]
*Normally present in oily areas on the external [[Ear - Anatomy & Physiology|ear]] canal and [[Skin - Anatomy & Physiology|skin]] in dogs
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**Some strains have been recovered from the [[Ear - Anatomy & Physiology|ear]] canal of cats
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*Bottle-shaped, small budding cells, non-mycelial
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''Malassezia pachydermidis'' is commonly found on healthy skin and mucosa.  It is an opportunistic pathogen of both cats and dogs, and during infection it may increase 100-10000 fold on the skin.  It is most commonly recovered from the ear, anus, and the paws. 
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*Gram stain shows purple yeast cells with a very wide base
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Some breeds are more predisposed than others, with Dachshunds and Cocker spaniels amongst the most commonly seen.  ''M. pachydermidis'' is seen concurrently with a ''Staphylococcus intermedius'' infection. 
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*Grows on Sabouraud's Dextrose agar in 2 weeks of incubation at room temperature
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Hot, humid conditions favour the development of the infection.
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*Greenish discolouration on blood agar
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''M. Pachydermatitis'' is bottle-shaped, and non-mycelial. 
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*Clinical disease may cause yeast to proliferate and cause infection
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Gram stain shows purple yeast cells with a very wide base, and has a greenish discolouration on blood agar.
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*Grossly:
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Causes [[Malassezia Dermatitis]]
**Regional lesions: muzzle, [[Ear - Anatomy & Physiology|ears]], interdigital, perianal
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**Or generalised disease
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**Erythematous, hyperpigmented, [[Skin Glossary - Pathology|lichenified]] and scaly lesions with alopecia
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*Microscopically:
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**[[Skin Glossary - Pathology|hyperkeratosis, parakeratosis]]
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**Spongiotic pustular dermatitis
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**[[Skin Glossary - Pathology|Acanthosis]]
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**Organisms are usually present- minimum 3-5 yeasts per high-power field must be found to imply cause of disease
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*''Malassezia pachydermis'' in [[Mycotic skin infections - Pathology#Malassezia dermatitis|malassezia dermatitis]][[Category:Yeast-like_Fungi]]
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{{unfinished}}
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[[Category:Yeast-like Fungi]]
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[[Category:To Do - Fungi]]
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