Difference between revisions of "Malassezia pachydermidis"

Latest revision as of 15:56, 24 May 2011

Malassezia pachydermidis - Copyright Professor Andrew N. Rycroft, BSc, PHD, C. Biol.F.I.Biol., FRCPath

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.

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.

Hot, humid conditions favour the development of the infection.

M. Pachydermatitis is bottle-shaped, and non-mycelial.

Gram stain shows purple yeast cells with a very wide base, and has a greenish discolouration on blood agar.

Causes Malassezia Dermatitis

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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]]
-*Normally present in oily areas on the external [[Ear - Anatomy & Physiology|ear]] canal and [[Skin - Anatomy & Physiology|skin]] in dogs
-**Some strains have been recovered from the [[Ear - Anatomy & Physiology|ear]] canal of cats
-*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.
-*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.
-*Grows on Sabouraud's Dextrose agar in 2 weeks of incubation at room temperature
+Hot, humid conditions favour the development of the infection.
-*Greenish discolouration on blood agar
+''M. Pachydermatitis'' is bottle-shaped, and non-mycelial.
-*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.
-*Grossly:
+Causes [[Malassezia Dermatitis]]
-**Regional lesions: muzzle, [[Ear - Anatomy & Physiology|ears]], interdigital, perianal
-**Or generalised disease
-**Erythematous, hyperpigmented, [[Skin Glossary - Pathology|lichenified]] and scaly lesions with alopecia
-*Microscopically:
-**[[Skin Glossary - Pathology|hyperkeratosis, parakeratosis]]
-**Spongiotic pustular dermatitis
-**[[Skin Glossary - Pathology|Acanthosis]]
-**Organisms are usually present- minimum 3-5 yeasts per high-power field must be found to imply cause of disease
-*''Malassezia pachydermis'' in [[Mycotic skin infections - Pathology#Malassezia dermatitis|malassezia dermatitis]][[Category:Yeast-like_Fungi]]
+{{unfinished}}
-[[Category:To_Do_-_Fungi]]
+[[Category:Yeast-like Fungi]]
+[[Category:To Do - Fungi]]

Difference between revisions of "Malassezia pachydermidis"

Latest revision as of 15:56, 24 May 2011

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