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House Microbiology > Cutaneous mycosis > Flashcards

Cutaneous mycosis Flashcards

1
Q

Morbidity and Mortality of cutaneous mycoses

Infections are (common or rare?)

Exact prevalence (known or unknown?)

More common in (children or adult?)

A

Common

Unknown

Children

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2
Q

Morbidity and Mortality of cutaneous mycoses

Most infections are (serious or not serious?)

Immuno________ individuals

(Typical or Atypical?) , (locally or systemically?) aggressive lesions

A

Not serious

suppressed

Atypical, locally

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3
Q

DERMATOPHYTOSES

Three genera- _______,_______,_______

A

Trichophyton, Epidermophyton, Microsporum

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4
Q

Anthropophilic-reside on the ________

Zoophilic-reside on the ___________

Geophilic-reside in _____

A

human skin

skin of domestic and farm animals

Soil

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5
Q

DERMATOPHYTOSES
Transmission from humans or animals is by _______

A

infected skin scales

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6
Q

DERMATOPHYTOSES

Pathology
Dermatophytes use ______ as a source of nutrition

A

keratin

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7
Q

DERMATOPHYTOSES

Pathology

they infect _____,_____,_____

A

skin, hair, nails

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8
Q

DERMATOPHYTOSES

Pathology

All 3 organisms infect ________

A

attack skin

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9
Q

Microsporum does not infect _____

A

nails

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10
Q

Epidermophyton does not infect ________

A

hair

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11
Q

Dermatophytes invade underlying non- keratinized tissues

T/F

A

F

they do not invade underlying non- keratinized tissues

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12
Q

Zoophilic dermatophytes?

A

Microsporum

Trichophyton

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13
Q

CLINICAL SIGNIFICANCE
DERMATOPHYTOSES

Characterized by _____ ,________ that can become _______ and ____

A

itching,scaling skin patches

inflamed and weeping

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14
Q

DERMATOPHYTOSES Infection in different sites may be due to different organisms and is given different names

T/F

A

F

but is given one name

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15
Q

DERMATOPHYTOSES

Transmission Contact with:
–_______
–______

A

Arthrospores

Conidia

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16
Q

DERMATOPHYTOSES

Transmission Contact with:
– Arthrospores
• ( Sexual or Asexual?) spores formed in the _______ of the ______ stage

A

Asexual

hyphae

parasitic

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17
Q

DERMATOPHYTOSES

Transmission Contact with:

– Conidia
•______________ spores formed in the “ _____ ” _________ stage

A

Sexual or asexual

free-living

environmental

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18
Q

DERMATOPHYTOSES Transmission

Modes of transmission
– ______ with ____________
– __________ hairs/scales
–_______
– ______

A

Contact; infected animals/humans

Airborne

Fomites

Soil

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19
Q

tinea _______ - ringworm infection of the scalp (crusty hair)

A

favosa

20
Q

tinea ____ - ringworm infection of the body (smooth skin)

A

corporis

21
Q

tinea _____ - ringworm infection of the groin (_______)

A

cruris

jock itch

22
Q

tinea ______ - ringworm infection of the nails

A

unguium

23
Q

tinea _____ - ringworm infection of the beard

A

barbae

24
Q

tinea ________ - ringworm infection of the hand

A

manuum

25
Q

tinea ______ - ringworm infection of the foot (_______)

A

pedis

athlete’s foot

26
Q

tinea ______ - ringworm infection of the heads

A

capitis

27
Q

tinea _____ - ringworm infection of the eyebrows

A

capitis

28
Q

tinea ____ - ringworm infection of the eyelashes

A

capitis

29
Q

tinea ____ - ringworm infection of the scalp

A

capitis

30
Q

Diagnosis of dermatophytoses

Collection of samples

Specimens of skin, hair, nails Collected in ______________

A

folded black paper

31
Q

Diagnosis
Collection of samples,

Stored up to ___________

A

12 months

32
Q

Diagnosis
Collection of samples,

Nails by _______
Skin by _______ with ________
Hair by _______

A

clippings

scrapping

blunt scalpel

plucking

33
Q

PITYRIASIS VERSICOLOR (Tinea versicolor)

(Superficial or deep?) (acute or chronic?) infection of _________

A

Superficial

Chronic

Stratum corneum

34
Q

PITYRIASIS VERSICOLOR ( ______________ )

A

Tinea versicolor

35
Q

PITYRIASIS VERSICOLOR (Tinea versicolor)

Etio: __________ (Pityrosporum orbiculare), a Lipophilic ( yeast or mold?)

A

Malassezia furfur

Yeast

36
Q

PITYRIASIS VERSICOLOR (Tinea versicolor)

Manifest as ___________

A

patches of discoloration of skin,

37
Q

Diagnosis of P.vesicolor

_______ , can be used to look for _____________ which is typical of pityriasis versicolor.

___________ to confirm the diagnosis.

A

Wood’s lamp

yellow fluorescence

Skin scrapings

38
Q

PITYRIASIS vesicolor

Under Direct microscopy has a _________________ appearence

A

sphagetti and meatball

39
Q

Dermatophyte infections are not usually limited to the epidermis.

T/F

A

F

They are

40
Q

MAJOCCHI’S GRANULOMA

is an uncommon condition in which the dermatophyte invades the ___________ or ________

A

dermis or subcutaneous tissue.

41
Q

MAJOCCHI’S GRANULOMA

Can be precipitated by _________ or _________

A

trauma to skin or occlusion of hair follicles

42
Q

MAJOCCHI’S GRANULOMA

Common etiological agent is __________

A

T.rubrum

43
Q

Lab diagnosis of MAJOCCHI’S GRANULOMA
Skin biopsy
Look for fungal hyphea

*A potassium hydroxide (KOH) preparation, which identifies fungal forms only within the _________, may be (positive or negative?)

A

stratum corneum

negative

44
Q

Candidiasis can Present as Skin lesions

T/F

A

T

45
Q

Diagnosis

Wood’s lamp examination - detects ___________

Potassium hydroxide microscopy- Detects ______ and ____ in skin scrapings or hair

Fungal cultures- Required to ________

,

A

Detects fluorescence

hyphae and conidia

identify organism

House Microbiology (93 decks)

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