Staphylococcal pyoderma

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Ninety percent of canine pyodermas are caused by (previously called ), a Gram-positive, facultative aerobic, beta-haemolytic, coagulase-producing bacterium. Other coagulase-positive and coagulase-negative staphylococci (, , and ) and other Gram-positive and Gram-negative bacteria, such as or spp. and , may be isolated occasionally. In cats, and are considered the main causes of feline pyoderma, excluding abscesses. This chapter discusses Aetiology and pathogenesis; Differential diagnosis; Clinical approach; Diagnostic tests; and Treatment.

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23.4 Erythema and mild exudation in intertrigo (skin fold pyoderma).
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23.5 Alopecia, erosion and exudation in pyotraumatic pyoderma (‘hot spot’).
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23.6 German Shepherd Dog cross with mucocutaneous pyoderma. Note the perioral erosions, ulcerations and crusts.
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23.7 Diffuse erythema in a dog as a result of bacterial overgrowth.
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23.8 Small pustules on the abdomen of a puppy with bacterial impetigo.
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23.9 Bacterial folliculitis. Pustules: the primary lesion. Patchy alopecia (moth-eaten coat), which is characteristic in short-haired breeds.
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23.10 Large collarettes and an erythematous mildly exudative advancing edge of infection in superficial spreading pyoderma.
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23.11 Furuncles, ulceration, draining tracts and crusts on the lateral thigh of a German Shepherd Dog.
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23.12 Callus pyoderma. Note the draining sinus tracts.
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23.13 Interdigital pyogranuloma.
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23.14 Feline chin acne complicated by deep pyoderma.
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23.15 Investigation of the clinical signs associated with pyoderma. GSD = German Shepherd Dog.
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23.17 Intracellular cocci in degenerated neutrophils, diagnostic of pyoderma.

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