Difference between revisions of "Yeast-like fungi"

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#REDIRECT[[:Category:Yeast-like Fungi]]
 
 
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[[Candidosis]]
 
 
 
 
 
[[Cryptococcosis]]
 
 
 
 
 
==Geotrichosis==
 
 
 
*''G. candidum''
 
 
 
*Rare
 
 
 
*Two forms: the yeast-like (glaborous) and fluffy
 
 
 
*Affects a wide range of species
 
 
 
*Usually diagnosed post-mortem
 
 
 
*Affects the mucous membranes, udder, [[Bronchi and bronchioles - Anatomy & Physiology|bronchi]] and [[Lungs - Anatomy & Physiology|lungs]]
 
 
 
*Usually mild, causing suppurative granulomas
 
 
 
*Can be recovered from otitis externa infections in dogs
 
 
 
*Organisms appear as rectangular or spherical arthrospores on wet mounts
 
**Thick walled, non-budding, gram positive
 
 
 
*Grow on Sabouraud's Dextrose agar
 
**Membranous colonies
 
**Do not grow well on blood agar
 
 
 
==''Malassezia pachydermidis''==
 
[[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
 
 
 
*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, [[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]]
 
 
 
==''Rhodotorula''==
 
 
 
*''Rhodotorula minuta'' and ''R. rubra''
 
 
 
*Canine [[Ear - Anatomy & Physiology|ear]] infections
 
 
 
*Equine [[Female Reproductive Tract -The Uterus - Anatomy & Physiology|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, [[Mycotic skin infections - Pathology#Superficial mycoses|skin infections]] in horses and monkeys, mastitis in cattle and sheep and in feline bladder infections
 
 
 
*''T. capitum'' implicated in bovine mastitis
 
 
 
==Further Links==
 
 
 
*[[Mycotic skin infections - Pathology]]
 
 
 
*[[Antifungal Drugs]]
 

Latest revision as of 14:21, 29 April 2010