Difference between revisions of "Malassezia pachydermidis"
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Hot, humid conditions favour the development of the 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 | *Gram stain shows purple yeast cells with a very wide base | ||
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*Grows on Sabouraud's Dextrose agar in 2 weeks of incubation at room temperature | *Grows on Sabouraud's Dextrose agar in 2 weeks of incubation at room temperature | ||
| − | + | It has a greenish discolouration on blood agar. | |
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*Grossly: | *Grossly: | ||
Revision as of 12:56, 15 July 2010
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
- Grows on Sabouraud's Dextrose agar in 2 weeks of incubation at room temperature
It has a greenish discolouration on blood agar.
- Grossly:
- Regional lesions: muzzle, ears, interdigital, perianal
- Or generalised disease
- Erythematous, hyperpigmented, lichenified and scaly lesions with alopecia
- Microscopically:
- hyperkeratosis, parakeratosis
- Spongiotic pustular dermatitis
- Acanthosis
- Organisms are usually present- minimum 3-5 yeasts per high-power field must be found to imply cause of disease
- Malassezia pachydermis in malassezia dermatitis