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Mycology > Cutaneous Fungi > Flashcards

Cutaneous Fungi Flashcards

1
Q

Superficial fungi

A

Malassezia furfur
Exophiala werneckii
Piedraia hortae
Trichosporon beigelii

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2
Q

Dermatophytes

A

Microsporum
Trichophyton
Epidermophyton

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3
Q

Alopecia

A

Baldness

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4
Q

Anthropophilic

A

Infection passed human to human

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5
Q

Ectothrix

A

Fungi produce arthrospores on surface of hair shaft or just beneath cuticle where break out onto hair shaft

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6
Q

Endothrix

A

fungi invade hair shaft and produce arthrospores within the shaft

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7
Q

Favus

A

Severe disfiguring fungal disease
Classical feature is development of cup-shaped scutula on surface of scalp

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8
Q

Geophilic

A

Dirt loving, infection in man comes from contact with soil containing infecting organism

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9
Q

Piedra

A

Spanish for stone
Fungal disease of hair characterized by formation of numerous hard, small waxy concretions on the hair shaft

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10
Q

Tinea

A

Ringworm or superficial infection of the skin, nail, hair
On body surface fungal infection forms a ring shape lesion that was once thought to be caused by parasite

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11
Q

Zoophilic

A

Infection passed from animal to animal; man sometimes is an accidental host

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12
Q

Tinea pedis

A

Athletes food
Infection of the feet
Organism invades particularly the toe and soles
Most commonly caused by: E. floccosum, T. mentagrophytes, and T. rubrum

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13
Q

Tinea unguium

A

Infection of the nails
Infection lies between nail and bed forming a yellow detritus
Over time, nail plate fragments and may completely disintegrate
Most common - T. rubrum and E. floccosum

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14
Q

Tinea corporis

A

Ringworm
Infection involves glabrous skin and produces lesions that vary from those of simple scaling to deep granulomatous lesions
Characterized by ringed skin lesions which have active erythematous margins
Most common - T. rubrum and T. mentagrophytes

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15
Q

Tinea barbae

A

Barber’s itch
Infection of bearded areas of face and neck
Found in areas where cattle are raised, milked, or fed
Lesions involve skin of the beck where a granulomatous process can involve deeper layers of the skin
Most common - T. mentagrophytes, T. verrucosum, T. rubrm, M. canis

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16
Q

Tinea capitis

A

Ringworm of the scalp
Ectothrix (fungus invades hair shaft) - M. audouinii, M. canis, M. gypseum, T. mentagrophytes, T. verrucosum, T. rubrum
Endothrix (fungus infection within hair shaft) - T. tonsurans, T. violaceum, T. schoenleinii

17
Q

Tinea favosa

A

Chronic ringworm infections of scalp that leads to scarring and baldness
T. schoenleinii, T. violaceum, M. gypseum

18
Q

Tinea cruris

A

Jock itch, infection of the groin and perianal region
T. rubrum, E. floccosum

19
Q

Microsporum species Infection locations

A

Hair and Skin only
Ectothrix
Fluoresces green under Woods lamp

20
Q

Microsporum Macroconidia

A

Multi-septate with rough or spiny surfaces usually clavate or fusiform - never pencil shaped

21
Q

Microsporium microconidia

A

Fewer than Trichophyton
Small, spherical to oval attached directly on hyphal

22
Q

Trichophyton species infection information

A

Attacks hair, skin, and nails

23
Q

Trichophyton Macroconidia

A

Smooth tin walled and fewer septations than Microsporium
Cigar or pencil shaped
Maybe absent

24
Q

Trichophyton Microconidia

A

Produced in profusion and are borne laterally along the hyphae or in clusters

25
Q

Epidermophyton species infection information

A

Infects skin and nails

26
Q

Epidermophyton Macroconidia

A

Large only 2-6 septa, thick walled clavate with smooth surface form in clusters of 2 or 3 short blunt conidiophores

27
Q

Epidermophyton Microconidia

A

Absent

28
Q

T. mentagrophytes Testing

A

Fluorescence Negative
Hair Baiting Positive
Urease Positive
Ectothrix - No reverse red pigment

29
Q

T. rubrum Testing

A

Fluorescence Negative
Hair Baiting Fails to Perforates hair
Urease negative
Ectothrix: Reverse red color on CMA

30
Q

T. tonsurans Testing

A

Fluorescence Negative
Hair Baiting N/A
Endothrix

31
Q

T. violaceum Testing

A

Fluorescence Negative
Hair Baiting N/A
Endothrix

32
Q

T. verrucosum Testing

A

Fluorescence Negative
Hair Baiting N/A
Endothrix

33
Q

M. canis Testing

A

Fluorescence Positive
Hair Baiting N/A
Ectothrix
Growth on Polished Rice

34
Q

M. gypseum Testing

A

Fluorescence Negative
Hair Baiting N/A
Ectothrix
Grows on Polished Rice

35
Q

M. audouinii Testing

A

Fluorescence Positive
Hair Baiting N/A
Ectothrix
Does not grow on Polished Rice

Mycology (9 decks)

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