Dermatophytes/superficial mycoses (DRTM)
Terms
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- What are the 2 types of superficial mycoses?
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1. Skin infections
2. Hair infections
(what about nail? oh well) - What 2 organisms cause skin infections?
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Malassezia furfur
Exophiala werneckii -
What does M furfur cause?
What is its morphology like? -
-Pityriasis versicolor
-Spaghetti/meatballs - What does Exophiala werneckii cause?
- Tinea nigra
- What is the name of hair infections with mold?
- Black/white piedra
- What causes black piedra?
- Piedraia hortai
- What causes white piedra?
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Trichosporon beigelii
Trichosporon cutaneum - What is trichosporon though?
- A YEAST
- What is tinea capitis?
- Ringworm of the hair/face
- What is Tinea barbae?
- beard
- What is Tinea corporis?
- body
- What is Tinea cruris?
- jock itch
- What is Tinea unguinum?
- onychomychosis - nail inf
- What is Tinea pedis?
- foot
- What is Favus, and what causes it?
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A type of tinea capitis, corporis, OR unguinum
-Caused by Trichophyton schoenleinii - What characteristic is used to identify Favus?
- Favic chandeliers - anter like hyphae.
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Infection types caused by:
-Microsporum
-Trichophyton
-Epidermophyton -
Micro = hair/skin
Tricho = hair/skin/nails
Epiderm = skin/nails -
What feature identifies:
-Microsporum
-Trichophyton
-Epidermophyton -
Micro = tapered macroconidia
Tricho = microconidia
Epiderm = club macroconidia - what are club-shaped conidia called again?
- CLAVATE
- Name the 3 microsporum spec.
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1. Microsporum audounii
2. Microsporum canis
3. Microsporum gypseum - Name the 4 Trichophyton spec.
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1. Trichophytn mentagrophytes
2. Trichophyton rubrum
3. Trichophyton tonsurans
4. Trichophyton schoenleinii - What test is used to identify T. mentagrophytes when both it and rubrum are red?
- Hair penetration test
- Which mold can penetrate infant hair autoclaved and incubated for 2-3 wks?
- Trichophyton MENTAGROPHYTES; differentiate from T. rubrum.
- What instrument is used to see tinea nigra/versicolor?
- Wood's lamp
- What is necessary to get Malessezia furfur to grow?
- Overlaying with mineral oil.
- What organism causes tinea capitis?
- Trichophyton tonsurans; endemic in latin america.
- Other than hair penetration what seperates T. rubrum from mentagrophytes?
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Urease test;
Mentagrophytes = pos
Rubrum = neg - How do you differentiate the microsporum species?
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By their macroconidia;
-audouinii has FEW
-canis has pointy ends, echinulate, and thick walls
-gypseum has rounded ends, fewer septations, thin walls - What 4 things distinguish microsporum audouinii?
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1-lack of macroconidia
2-intercalcary
3-terminal, pointed chlamydoconidia
4-pectinate hyphae - How are microsporum species distinguished macroscopically
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COLOR
-audouinii = off white front, ORANGE BACKSIDE
-canis = white front, yellow backside
-gypseum = buff to tan - make sure to finish this.
- ok
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WHAT IS IT? - MALASSEZIA FURFUR
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WHAT IS IT? - malessezia furfur
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WHAT IS IT? - tinea nigra
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WHAT IS IT? - tinea nigra
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WHAT IS IT? - tinea nigra, caused by exophiala werneckii
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WHAT IS IT? - tinea nigra, caused by exophiala werneckii
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WHAT IS IT? - tinea capitis
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WHAT IS IT? - tinea capitis
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WHAT IS IT? - tinea capitis
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WHAT IS IT? - tinea barbae
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WHAT IS IT? - tinea corporis
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WHAT IS IT? - tinea unguinum (onychomycosis)
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WHAT IS IT? - tinea pedis
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WHAT IS IT? - epidermophyton floccosum
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WHAT IS IT? - epidermophyton floccosum
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WHAT IS IT? - epidermophyton floccosum
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WHAT IS IT? -
Microsporum auduinii
-off white front
-orange reverse -
WHAT IS IT? -
Microsporum audouinii
-Intercalcary
-Terminal chlamydoconidia -
WHAT IS IT? -
Microsporum audouinii
-Intercalcary
-Terminal chlamydoconidia -
WHAT IS IT? -
Microsporum canis
-White front
-Yellow reverse -
WHAT IS IT? -
Microsporum canis
-White front
-Yellow reverse -
WHAT IS IT? -
Microsporum canis
-Pointed, echinulate macrocon
-Thick walls, 6+ septations -
WHAT IS IT? - microsporum canis
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WHAT IS IT? -
microsporum gypseum
-buff to tan -
WHAT IS IT? -
microsporum gypseum
-buff to tan -
WHAT IS IT? - Microsporum gypseum
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WHAT IS IT? - microsporum gypseum
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WHAT IS IT? - microsporum gypseum
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WHAT IS IT? -
Trichophyton mentagrophytes
-downy form -
WHAT IS IT? -
Trichophyton mentagrophytes
-Downy form with
-BEDSPRING HYPHAE
-tearshaped microconidia -
WHAT IS IT? -
Trichophyton mentagrophytes
-Granular form
-pencil macroconidia
-Grapelike microconidia -
WHAT IS IT? -
Trychophyton mentagrophytes
-granular form
-grape like microconidia -
WHAT IS IT? -
Trichophyton RUBRUM
rubrum = red reverse
fron = white -
WHAT IS IT? - trichophyton rubrum
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WHAT IS IT? - trichophyton rubrum
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WHAT IS IT? - trichophyton rubrum
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WHAT IS IT? - Trichophyton rubrum - numerous sessile tear-shaped microconidia
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WHAT IS IT? - infection of trichophyton tonsurans - most common cause of tinea capitis
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WHAT IS IT? -
trichophyton tonsurans
-very variable microconidia -
WHAT IS IT? -
trichophyton tonsurans
-so variable! -
WHAT IS IT? -
trichophyton tonsurans
sooo very variable -
WHAT IS IT? - favus, caused by trichophyton schoenlenii - favic chandeliers
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WHAT IS IT? - Trichophyton schoenleinii
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WHAT IS IT? - trichophyton schoenleinii
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WHAT IS IT? -
trichophyton shoenleinii
-favic chandeliers -
WHAT IS IT? -
trichophyton shoenleinii
-favic chandeliers