Yeast-like fungi
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Malassezia pachydermidis
- Normally present in oily areas on the external ear canal and skin in dogs
- Some strains have been recovered from the ear canal of cats
- Bottle-shaped, small budding cells, 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
- Greenish discolouration on blood agar
- Clinical disease may cause yeast to proliferate and cause infection
- 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
Rhodotorula
- Rhodotorula minuta and R. rubra
- Canine ear infections
- Equine uterus
- Seldom seen in animal infections
Torulopsis glabrata
- Commensal in animals and is found in the soil
- Implicated in cases of:
- Pyelonephritis, pneumonia, septicaemia and meningitis (humans)
- Mastitis and abortion in cattle
- Systemic infection of monkeys and dogs
Trichosporonosis
- Found in soil
- Deuteromycetes yeast
- Trichosporonosis beigelii
- Implicated in feline nasal granuloma, skin infections in horses and monkeys, mastitis in cattle and sheep and in feline bladder infections
- T. capitum implicated in bovine mastitis