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Clinical Pathology > Microbiology 5 (mycology) > Flashcards

Microbiology 5 (mycology) Flashcards

1
Q

olive oil

A

malasezia furfur

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2
Q

Ascospone agar

A

Saccharomyces

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3
Q

Potato dextrose or potato flake agar

A

Trichophyton rubrum

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4
Q

Czapek-Dox agar

A

Aspergillus

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5
Q

Bird seed agar

A

melanin in Cryptococcus

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6
Q

Dimorphic fungi (5)

A 
histoplasma
blastomyces
coccidioides
sporothrix
paracoccidioides
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7
Q

Dematiaceous molds (7)

A 
Alternaria
Bipolaris
Curvularia
Exophiala
Fonsecaea
Phialaphora
Wangiella
(Alternatively, bipedal children eagerly formulate perfect words)
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8
Q

Aseptate molds (zygomycetes) (6)

A 
Mucor
Rhizopus
Absidia
Circinella
Cunninghamella
Syncephalastrum
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9
Q

Yeasts with arthroconidia (2)

A

Trichosporum

Geotrichum

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10
Q

Dimorphic molds tend to grow _____

A

slowly

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11
Q

“lid lifters”

A

suggests zygomycetes (aseptate molds)

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12
Q

Cornmeal Tween 80 agar

A

yeast morphology

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13
Q

3 pathogens completely inhibited by cyclohexamide

A

Zygomycetes
Aspergillus
Cryptococcus

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14
Q

stimulation tests (inositol and thiamine) are good for identifying

A

Trichophyton species

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15
Q

Phenol oxidase test (staib test)

A

Cryptococcus + from Candida -

T. mentagrophytes + from T. rubrum -

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16
Q

In order to convert to yeast, histoplasma needs to

A

be plated on BHI with blood

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17
Q

In order to convert to yeast, blastomyces needs to

A

be plated on BHI or cottonseed agar

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18
Q

antigen detection of crypto in CSF can be enhanced by

A

pretreatment with pronase

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19
Q

histoplasma mold form

A

lollipop microconidia, spiked macroconidia

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20
Q

Ohio and Mississippi river valley

A

histoplasma

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21
Q

histologically, coccidioides may be confused with

A

Rhinosporidium seeberi and prototheca wickerhami

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22
Q

classic presentation of Prototheca

A

olecranon bursitis

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23
Q

“barrel-shaped” arthroconidia

A

coccidioides mold form

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24
Q

valley fever

A

coccidioides immitis

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25
Q

Risk factors for disseminated coccidioides

A

blood group B
3rd trimester of pregnancy
Filipino or AA

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26
Q

Mold form of blasto

A

smooth, lollipop conidia

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27
Q

host for blasto

A

dogs

28
Q

dimorphic fungi that disseminates to bone

A

blasto

29
Q

subcutaneous dimorphic fungus

A

Sporothrix schenckii

30
Q

Identifying feature of paracoccidioides

A

“mariner’s wheel” in tissue

31
Q

in culture, mold of paracoccidioides is identical to

A

Blasto (lollipops)

32
Q

3 dermatophytes that produce Macroconidia

A

Microsporum canis
Microsporum gypseum
Epidermyphyton floccsum

33
Q

Identify microsporum canis

A

Spindle-shaped macroconidia

34
Q

Identify microsporum gypseum

A

Oval macroconidia

35
Q

Identify epidermophton floccosum

A

Club-shaped macroconidia

36
Q

Identify Trichophyton rubrum

A

“birds on a wire”

red pigment

37
Q

Identify Trichophyton mentagraphytes

A

Grape-like clusters

38
Q

Identify Trichophyton tonsurans

A

variability in size and shape of microconidia

39
Q

3 dermatophytes producing microconidia

A

Trichophyton rubrum
Trichophyton mentagraphytes
Trichophyton tonsurans

40
Q

Dermatophytes that cause destruction of hair shaft

A

Microsporum canis
Microsporum gypseum
Trichophyton verrucosum

41
Q

Identify A. fumigatus

A

colony: blue-green with white skirt
Conidiophore: single row with conidia only on top

42
Q

Identify A. niger

A

colony: black front, yellow-grey reverse

43
Q

Identify A. terreus

A

Colony: cinnamon/buff
Conidiophore: 2 rows of phialides

44
Q

Identify A. flavus

A

Colony: yellow/green
Coniodiophore: Lollipop

45
Q

Otitis externa

A

Aspergillus niger

46
Q

Golf-ball conidia

A

Gliocladium (a hyaline septate mold)

47
Q

Fusiform macroconidia

A

Fusaria

48
Q

“broom-like” conidia

A

Penicillum

49
Q

Colonies pigmented on front and back

A

Dematiaceous molds

50
Q

Conidia of Bipolaris look like

A

Microsporum gypseum

51
Q

Longer and thinner conidia than Bipolaris

A

Exserohilum

52
Q

“bottle-brush” conidia

A

Helminthosproum

53
Q

Dematiaceous molds with transverse and longitudinal septa

A

Alternaria
Ulocladum
Stemphilium

54
Q

3 principle causes of chromoblastosis

A

Phialophora
Cladosporum
Fonsecaea

55
Q

Zygomycete with sporangiophores directly over rhizoids

A

Rhizopus

56
Q

Zygomycete with sporangiophores between rhizoids

A

Absidia

57
Q

Distinguish Geotrichum from Trichoporon (both are arthroconidia-producing yeasts)

A

Trichoporon is urease + and has “rabbit ears”

Georichum has “hockey stick”

58
Q

Urease + fungi

A 
Cryptococcus
Rhodotorula
Candida krusei
Trichophyton mentagrophytes
Trichosporon
59
Q

Cryptococcus able to cause infection in immunocompetent host

A

C. gattii

60
Q

White piedra

A

Trichosporon beigelii

61
Q

Red pigment colonies

A

Rhodotorula
Penicillium
Fusarium

62
Q

Protothecosis is

A

Algae

63
Q

Lobomycosis caused by

A

Loboa loboi, does not grow in colonies

64
Q

Candida resistant to fluconazole

A

C. krusei (sometimes C. glabrata)

65
Q

Candida resistant to Amphotericin B

A

C. lusitaniae

Clinical Pathology (59 decks)

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