Malassezia dermatitis

image of Malassezia dermatitis
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are commonly found on the skin of most mammals. Opportunistic skin and ear infections involving frequently complicate many skin conditions. Prompt identification and effective treatment is therefore important. The following are considered: species and ecology; Virulence factors and host susceptibility; Zoonotic potential; Clinical presentation; Diagnostic tests; and Treatment.

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25.1 The characteristic ‘peanut’, ‘Russian doll’ or ‘snowman’ shapes of budding isolated from a dog. (Diff-Quik stain; original magnification x1000)
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25.2 The frequency of colonization of different body sites in atopic dogs (modified from ). Drawn by S.J. Elmhurst BA Hons (www.livingart.org.uk) and is printed with her permission.
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25.4 German Shepherd Dog suffering from severe atopic dermatitis and secondary dermatitis. The dog responded well to twice weekly bathing with a 2% chlorhexidine/2% miconazole shampoo and 5 mg/kg orally q24h ciclosporin.
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25.5 Erythema, alopecia and scaling of the foot in a Boxer with dermatitis secondary to hyperadrenocorticism. The skin was also greasy and malodorous. Chronic dermatitis of the ventral neck in an atopic Staffordshire Bull Terrier. The affected skin is erythematous, alopecic, lichenified and seborrhoeic.
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25.6 Erythemato-ceruminous otitis externa in a Weimeraner with an cutaneous adverse food reaction. Note the diffuse erythema of the ventral pinna and dark brown waxy discharge around the opening the vertical ear canal.
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25.7 Idiopathic facial dermatitis in a Persian cat. This condition is often associated with dermatitis, although even aggressive topical or systemic anti- treatment appears to have little clinical impact. Generalized alopecia and scaling associated with overgrowth in a Domestic Shorthaired cat with lymphocytic mural folliculitis. Generalized exfoliative dermatitis in cats is often associated with severe systemic disease. However, the mural folliculitis and dermatitis in this cat resolved spontaneously. Build up of brown waxy material on the proximal claw of a cat, associated with paronychitis.
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25.8 Impression smear from a dog stained with the Diff-Quik basophilic stain (pot 3) only. The organisms have clearly stained well but note the monochrome image. Compare with Figures 25.1 and 25.9 , which have been stained with both the eosinophilic (pot 2) and basophilic stains. (Original magnification x400)
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25.9 isolated on a stained tape strip preparation from a dog. This sample was stained with the eosinophilic (pot 2) and basophilic (pot 3) Diff-Quik stains. Compare the staining with that in Figure 25.8 , where the preparation was stained with only the basophilic stain. (Original magnification x400)
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