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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
| + | ''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
| + | 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
| + | Hot, humid conditions favour the development of the infection. |
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| − | *Greenish discolouration on blood agar
| + | ''M. Pachydermatitis'' is bottle-shaped, and non-mycelial. |
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| − | *Clinical disease may cause yeast to proliferate and cause infection
| + | Gram stain shows purple yeast cells with a very wide base, and has a greenish discolouration on blood agar. |
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| − | *Grossly:
| + | 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]]
| + | {{unfinished}} |
| | + | [[Category:Yeast-like Fungi]] |
| | + | [[Category:To Do - Fungi]] |