41 laboratorydiagnosisofcommonfungaldiseases-110919091652-phpapp01
TRANSCRIPT
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LABORATORY DIAGNOSIS OF COMMON FUNGAL DISEASES
Prof. Louella A. Dancel, RMT, MSc.
University of Perpetual Help System DALTA
42nd PAMET ANNUAL CONVENTIONManila Hotel – December 2,2006
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Clinical specimens submitted for Fungal Isolation 2004-2006*
Clinical specimen 2004 2005 2006 Total
Respiratory 29 35 34 98Body fluids 37 17 34 88Tissues 9 0 23 32Skin 1 0 0 1Nails 29 31 20 80Hair 0 1 0 1CSF 8 5 8 21Others 5 20 24 49TOTAL 118 109 153 380
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Fungal Isolates 2004-2006*Isolate 2004 2005 2006C.albicans 5.1% 13.8% 11.8%C.tropicalis 1.8% 3.7% 5.2%C.parapsilosis 5.1% 6.4% 3.9%C.glabrata 0.91% 0.91% 3.9%C.famata 1.8% 4.6% 2.0%Aspergillus spp. 0.91% 0% 0.65%Fusarium spp. 0% 0% 0.65%
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Data from a Five-year review of Fungal Isolates at UPM-CPH
• Clinical specimens (n=545):–Skin scrapings–Nail clippings/scrapings–Hair–Exudates–Biopsy materials
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Data from a Five-year review of Fungal Isolates at UPM-CPH
Total clinical specimens tested – 545 Results: 10.8%- (+) for both KOH & culture 59.1%- (-) for both KOH &culture 17.1% - (+)culture, (-) KOH 12.8% - (-) culture, (+) KOH
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Data from a Five-year review of Fungal Isolates at UPM-CPH
Fungal isolates : Trichophyton mentagrophytes Trichophyton rubrum Trichophyton tonsurans Trichophyton schoenlenii Trichosporon spp.
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Data from a Five-year review of Fungal Isolates at UPM-CPH
• Fungal isolatesMicrosporum gypseum
Microsporum canis Epidermophyton flocossum Candida albicans Exophiala werneckii
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Data from a Five-year review of Fungal Isolates at UPM-CPH
Fungal isolates from biopsy materials and exudates (31.2% positive):
Fonsecaea compactumPhialophora verrucosa
Exophiala jeanselmeiMadurella grisea
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Laboratory Methods for Diagnosis of Mycoses
I. DIRECT EXAMINATION: *10-30% KOH
*Calcofluor white stain *Histological stains- H&E, PAS *India Ink *Wet mount
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Laboratory Methods for Diagnosis of Mycoses
II. Isolation & CultureSDABHIA/BAP
Media with/without antibiotics
• Macroscopic examination of culture• Microscopic examination using LPCB
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Laboratory Methods for Diagnosis of Mycoses
• III. Biochemical Tests:*Rapid kits for yeasts*Urea test
• IV. Special Tests: *In-vitro hair perforation test
*Germ tube test *Chlamydoconidia formation test
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Mycotic Infections
Superficial
Cutaneous
Subcutaneous
Systemic
Opportunistic
*Mycotoxicosis
*Allergies
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Superficial mycoses• superficial cosmetic
fungal infections of the skin or hair shaft
• no living tissue is invaded
• no cellular response from the host
• no pathological changes
• patients unaware of infection
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Superficial mycosesDisease
SKIN• Pityriasis
versicolor
• Tinea nigra
Causative organisms
• Malassezia furfur
• Exophiala werneckii
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Superficial mycoses
Disease
HAIR• White piedra
• Black piedra
Causative organisms
• Trichosporon beigelii
• Piedraia hortae
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Superficial mycoses
Pityriasis versicolor• Lesion
-An-an”-Hyperpigmented or
hypopigmented macular lesions
www.ethnomed.org
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Superficial mycoses
Pityriasis versicolor• Lesion
– scale readily, giving a chalky branny appearance
– occurs on the trunk, shoulders & arms, face and neck
Modified from www.columbia.edu
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Superficial mycoses
Pityriasis versicolor
• Lesion– fluoresce pale greenish under Wood’s
lamp• Distribution
– worldwide– more common in tropical than
temperate climates
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Superficial mycoses
Pityriasis versicolorKOH of skin scrapings
• clusters of budding yeast-like cells & short angular hyphal forms
• “spaghetti and meat balls”
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Superficial mycoses
Pityriasis versicolorPAS of skin scrapings• “spaghetti and meat
balls”
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Superficial mycoses
Pityriasis versicolor• Culture of skin
scrapings– Not necessary– diagnostic microscopic
features– SDA overlaid with
peanut oil, olive oil
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Superficial mycoses
Pityriasis versicolor
• Etiologic Agent– Malassezia globosa
lipophilic yeastpart of skin normal flora
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Superficial mycoses
Pityriasis versicolor
• Treatment– keratinolytic agents applied locally– Mild fungicides– Miconazole– Selenium sulfide (1%) shampoo
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Superficial mycoses
Tinea nigra• Lesion
– Gray to black well-demarcated macular lesions
– most frequently occurring on the palms of the hand
– non-inflammatory & non-scaling lesions
11th.blogspot.com
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Superficial mycoses
Tinea nigra
• Distribution– world-wide– more common in tropical regions of
Central & South America, Africa, Southeast Asia & Australia
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Superficial mycoses
Tinea nigra
• KOH– pigmented brown to dark
olivaceous (dematiaceous) septate hyphal elements & 2-celled yeast cells
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Superficial mycoses
Tinea nigra
• Etiologic agent– Exophiala werneckii
saprophyte found in soil, compost, humus &
wood in humid tropical & sub-tropical regions
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Superficial mycoses
Tinea nigra
• Culture on SDA– initially mucoid,
yeast-like & shiny black
– with age: aerial mycelia & dark olive color
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Superficial mycoses
Tinea nigra
• Lactophenol cotton blue (LPCB) of culture on SDA– 2-celled, pale brown yeast cells– darkly pigmented septa (annelides)– one cell cylindrical, the other cell is
spindle-shaped– occur in aggregated masses
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Superficial mycoses
Tinea nigra• Treatment
– keratinolytic agents (Whitfield’s ointment)
– tincture of iodine, 2% salicylic acid, 3% sulfur
– miconazole nitrate, imidazoles, triazoles
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Superficial mycoses
Tinea nigra
• Prevention– avoid exposure to sources,
contaminated material
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Superficial mycoses
Piedra
• Fungus infection of the hair shaft
• presence of firm, irregular nodules
• Nodules - fungal elements cemented together along the hair shaft
• Multiple infections of the same strand
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Superficial mycoses
Piedra
Two varieties–White piedra–Black piedra
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Superficial mycoses
Black piedra• Lesion
– discrete, hard, gritty, brown to black concretions / nodules
– infection of hair• scalp hair -common• beard, moustache -
less common• axilla & groin hairs -
rare
www.doctorfungus.org
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Superficial mycoses
Black piedra - distribution
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Superficial mycoses
Black piedra
• Etiologic agent– Piedraia hortae– source of infection
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Superficial mycoses
Black piedra - lab diagnosis
• Direct microscopy– specimen - hair with nodules– 25% NaOH or KOH– dark septate hyphae
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Superficial mycoses
Black piedra - lab diagnosis
• Direct microscopy– round to oval asci;
hyaline, curved to fusiform ascospores
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Superficial mycoses
Black piedra - lab diagnosis
• Isolation – medium
– SDA with chloramphenicol
– SDA cycloheximide
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Superficial mycoses
Black piedra - lab diagnosis• Isolation -growth very slow
-dark brown to black-greenish brown,
short aerial mycelium
Heaped center
Flat periphery
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Superficial mycoses
White piedra• Infection of hair
shaft– face, axilla, genitals -
common– scalp, eyebrows,
eyelashes - less common
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Superficial mycoses
White piedra• Infection of hair
shaft– less common
scalp
eyebrow
eyelashes
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Superficial mycoses
White piedraNodule
• Soft, white, yellowish, beige or greenish nodule
• Discrete• more often coalescent,
forming an irregular transparent sheath
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Superficial mycoses
White piedra
• Distribution– common in S. America & Asia– sporadic in N. America & Europe
• Etiologic agent– Trichosporon beigelii or T. cutaneum
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Superficial mycoses
White piedra
• Ecology– soil, stagnant water– decaying fruit– spoiled food– sputum & body surfaces– horses
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Superficial mycoses
White piedra - lab diagnosis
• Microscopic direct examination– specimen - hair with nodules
– 10% KOH or 25% NaOH + 5% glycerin
– hyaline septate hyphae
– oval or rectangular arthroconidia
– occasional blastoconidia
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Superficial mycoses
White piedra - lab diagnosisIsolation• medium - SDA with
chloramphenicol without cycloheximide
• growth/culture– rapid– cream-colored, soft– membranous, wrinkled radial
furrows, irregular folding
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Superficial mycoses
White piedra - lab diagnosisIsolation• microscopic exam
of culture– hyaline hyphae
– arthroconidia
– blastoconidia
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Superficial mycoses
White piedra - lab diagnosis
• Physiological studies– does not ferment carbohydrates– assimilate dextrose, lactose, D-xylose,
inositol– negative KNO3 assimilation– urease positive– arbutin is split
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Superficial mycoses
Piedra - Treatment
• Shaving or cutting infected hair• Topical fungicides
– 1:200 bichloride of mercury– benzoic acid & salicylic acid combinations– 3% sulfur ointment– 2% formalin
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Cutaneous mycoses
skin
hair
nails
• No living tissue
• Host Rxn to fungus
keratinase
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Cutaneous mycosesDisease
• Dermatophytosis
Causative organisms
• Dermatophytes Microsporum
Trichophyton
Epidermophyton
ringworm
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Cutaneous mycosesDisease
• Candidiasis of skin, mucous membranes & nails
Causative organisms
• Candia albicans & related species
dermatomycosis Soil fungi (Scytalidium, Fusarium, etc.)
Systemic fungi (Histoplasma, etc)
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Ecological Groups ofDermatophytes
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Geophilic
• inhabit soil where they decompose keratinaceous debris
• Dead animals
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Zoophilic
• parasitic on animals
www.saanendoah.com www.kolumbus.fi
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Anthropophilic fungi
• primarily parasitic to man• man as exclusive host• for maintenance & dissemination of
species
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Anthropophilic fungi• Anthropophilic
fungi:– Examples:
• M. audonii• T. rubrum• T. schoenleinii• T. tonsurans• T. violaceum
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Classification of Dermatophytes
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Microsporum
MacroconidiaRough walled
Microconidapresent
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Trichophyton
MacroconidiaSmooth walled
Microconidiapresent
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Epidermophyton
ChlamydoconidiaMacroconidiaSmooth walled
Microconidianone
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Clinical Manifestations of Dermatophytes
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Tinea capitis
www.emedicinehealth.com
Scalp, eyebrow, eyelashes Microsporum &
Trichophyton
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Tinea capitis Endothrix Ectothrix
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Tinea favosa
• Scutulum• Mass of mycelia
& epithelial debris
• Cup shaped crusts
www.mf.uni-lj.si
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Tinea corporis
www.cut.ee/
•Non-hairy skin•Rings with scaly
centers•Rxn vs fungus
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Tinea corporis
• E. floccosum • Trichophyton
• Microsporum
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Cutaneous
Tinea imbricata
Concentric rings
Trichophyton concentricum
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Cutaneous
Tinea barbae
• Bearded areas of face & neck
www.merck.com
www.emedicine.com
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Cutaneous
Tinea cruris
www.dermnetnz.org
Jock itch
Moist groin
area
E. floccosum,
T. rubrum
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Cutaneous
Tinea pedis
www.doctorfungus.org
dermatologie.free.fr
Athlete’s foot
Toe webs & soles,
even nails
Id reaction,
circulating fungal
antigens
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Cutaneous
Tinea manuum
www.dermnetnz.org
• Interdigital areas & palmar surfaces
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Cutaneous
Tinea unguium
www.dermnetnz.org
Invasion of nail plate by
dermatophytes
Thickened, discolored &
brittle• Onychomycosis- non
dermatophyteYeast etc.
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Laboratory diagnosis
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Wipe with water
www.doctorfungus.org
scalpelPaper / envelope
active edge
Skin scraping specimen
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Direct Examination
• Wet mountKOH• KOH
– 10% to 30%– with Parker Superquink
blue-black ink– gentle warming
pa
rk
er
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Cutaneous
KOH of skin scrapings
Septate hypha
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Cutaneous
arthrospores
septate hypha
KOH of skin scrapings
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Cutaneous
Ectothrix invasion of hair
• Hair invasion • formation of
arthroconidia on the outside of hair shaft
• cuticle of hair is destroyed
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Cutaneous
Ectothrix invasion of hair
• Hair invasion by a dermatophyte– Microsporum canis– M. gypseum– Trichophyton equinum– T. verrucosum
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Cutaneous
Ectothrix invasion of hair
• Wood’s UV light• infected hairs
fluoresce• bright greenish
yellow under
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Cutaneous
Endothrix invasion of hair
• formation of arthroconidia within hair shaft
• cuticle of hair remains intact
• do not fluoresce under Wood’s UV light
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Cutaneous
Endothrix invasion of hair
• ALL AGENTS ARE ANTHROPOPHILIC
• Trichophyton tonsurans,
• T. violaceum
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Culture:
• Selective media– SDA with chloramphenicol &
cycloheximide (Mycosel or Mycobiotic agar)
– Dermatophyte test medium
Non-selective medium– Sabouraud’s dextrose agar
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Culture:
• IncubationRoom temperatureAt least 2 weeks
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Identification
• Gross color & texture• Microscopic characteristics• Confirm / compare with
Written descriptionsDrawingsphotographs
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Mycology
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Cutaneous
Microsporum canis
netti.nic.fi
• Zoophilic– cats and dogs
• Invades– Hair– skin – rarely nails
• distribution– worldwide
www.vet.ohio-state.edu
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Cutaneous
golden yellow reverse colony
www2.provlab.ab.ca
Microsporum canislab diagnosis –
culture• white cottony growth
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Cutaneous
Microsporum canis• microscopic:
– spindle shaped, one end pointed, other end blunt
– thick walled verrucose macroconidia
– 6 to 12 cellswww.doctorfungus.org
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Cutaneous
Microsporum gypseum
– geophilic– usually produces a single
inflammatory skin or scalp lesion• distribution
– worldwide
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Cutaneous
Microsporum gypseumlab diagnosis -
culture• flat, spreading suede-
like to granular • cinnamon growth • yellow brown pigment
on reverse of colony
www.ukneqasmicro.org.uk
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Cutaneous
Microsporum gypseummicroscopic: • symmetrical ellipsoidal• thin walled verrucose
macroconidia• distal end slightly rounded,
proximal (point of attachment) is blunt
• 4 to 6 cells
vtpb-www.cvm.tamu.edu
www.medmicro.wisc.edu
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Cutaneous
Trichophyton mentagrophytes
– zoophilic: mice, cats, horses, sheep, rabbits
– inflammatory skin or scalp lesions in humans
– ectothrix• distribution
– worldwide
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Cutaneous
Trichophyton mentagrophytes
• lab diagnosis - culture
• flat, white to cream color; powdery to granular surface
danival.org
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Cutaneous
Trichophyton mentagrophytesMicroscopic
spherical microconidia forming dense clusters,
“en-grappe”vtpb-www.cvm.tamu.edu
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Cutaneous
Trichophyton mentagrophytes
• spiral hyphae
smooth thin-walled clavate multiseptate macroconidia
Microscopic
www.vet.ohio-state.edu vtpb-www.cvm.tamu.edu
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Cutaneous
Trichophyton mentagrophytes
lab diagnosis
www2.provlab.ab.ca
positive urease production
positive for in-vitro hair perforation
www2.provlab.ab.ca
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Cutaneous
Trichophyton rubrum• anthropophilic
– chronic infections of the skin, nails, rarely scalp
– ectothrix or endothrix hair infection
• distribution– worldwide
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Cutaneous
Trichophyton rubrum
lab diagnosis – culture
• white, suede-like to downy
• wine red pigment on reverse side
www.pfizer.ch
www4.medfak.lu.se
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Cutaneous
Trichophyton rubrumwww2.provlab.ab.ca • lab diagnosis
– scanty to moderate numbers of slender clavate to pyriform microconidia
– arranged “en-thyrse”
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Cutaneous
Trichophyton concentricumAnthropophilicchronic non-inflammatory tinea corporistinea imbricata – concentric scaling of skinNot invade hair
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Cutaneous
Trichophyton concentricum
DistributionPacific Islands of OceaniaSoutheast AsiaCentral and South America
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Cutaneous
Trichophyton concentricumLab diagnosisSlow growing deeply folded thallusCream to orange brown in color Reverse buff to brown
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Cutaneous
Trichophyton concentricum
Microscopic –
“antler tips” hyphae,
chlamydoconidia
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Cutaneous
Trichophyton schoenleiniiAnthropophilicCause favusChronic scarring form of tinea capitisSaucer shaped crusted lesions or scutulaPermanent hair loss
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Cutaneous
Trichophyton schoenleiniiLab diagnosisCultureWaxy or glabrousDeeply folded honeycomb-like thallus with sub-surface growth
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Cutaneous
Trichophyton schoenleiniiLab diagnosisMicroscopic
Favic chandeliersNo macroconidiaNo microconidia
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Cutaneous
Epidermophyton floccosum
• anthrophophilic• does not invade
hair in vivo
• distribution– worldwide
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Cutaneous
Epidermophyton floccosum
Culture• greenish-brown or
“khaki” colored• suede-like surface• raised & folded center,
with flat periphery• yellowish brown reverse
pigment
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Cutaneous
Epidermophyton floccosum
botit.botany.wisc.edu
Microscopic• smooth thin-walled
macroconidia often in clusters growing directly from hyphae
• no microconidia• numerous
chlamydoconidia
www.fns.uniba.sk