Microbiology 5 (mycology)

Question 1

olive oil

Answer 1

malasezia furfur

Question 2

Ascospone agar

Answer 2

Saccharomyces

Question 3

Potato dextrose or potato flake agar

Answer 3

Trichophyton rubrum

Question 4

Czapek-Dox agar

Answer 4

Aspergillus

Question 5

Bird seed agar

Answer 5

melanin in Cryptococcus

Question 6

Dimorphic fungi (5)

Answer 6

histoplasma
blastomyces
coccidioides
sporothrix
paracoccidioides

Question 7

Dematiaceous molds (7)

Answer 7

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

Question 8

Aseptate molds (zygomycetes) (6)

Answer 8

Mucor
Rhizopus
Absidia
Circinella
Cunninghamella
Syncephalastrum

Question 9

Yeasts with arthroconidia (2)

Answer 9

Trichosporum

Geotrichum

Question 10

Dimorphic molds tend to grow _____

Answer 10

slowly

Question 11

“lid lifters”

Answer 11

suggests zygomycetes (aseptate molds)

Question 12

Cornmeal Tween 80 agar

Answer 12

yeast morphology

Question 13

3 pathogens completely inhibited by cyclohexamide

Answer 13

Zygomycetes
Aspergillus
Cryptococcus

Question 14

stimulation tests (inositol and thiamine) are good for identifying

Answer 14

Trichophyton species

Question 15

Phenol oxidase test (staib test)

Answer 15

Cryptococcus + from Candida -

T. mentagrophytes + from T. rubrum -

Question 16

In order to convert to yeast, histoplasma needs to

Answer 16

be plated on BHI with blood

Question 17

In order to convert to yeast, blastomyces needs to

Answer 17

be plated on BHI or cottonseed agar

Question 18

antigen detection of crypto in CSF can be enhanced by

Answer 18

pretreatment with pronase

Question 19

histoplasma mold form

Answer 19

lollipop microconidia, spiked macroconidia

Question 20

Ohio and Mississippi river valley

Answer 20

histoplasma

Question 21

histologically, coccidioides may be confused with

Answer 21

Rhinosporidium seeberi and prototheca wickerhami

Question 22

classic presentation of Prototheca

Answer 22

olecranon bursitis

Question 23

“barrel-shaped” arthroconidia

Answer 23

coccidioides mold form

Question 24

valley fever

Answer 24

coccidioides immitis

Question 25

Risk factors for disseminated coccidioides

Answer 25

blood group B
3rd trimester of pregnancy
Filipino or AA

Question 26

Mold form of blasto

Answer 26

smooth, lollipop conidia

Question 27

host for blasto

Answer 27

dogs

Question 28

dimorphic fungi that disseminates to bone

Answer 28

blasto

Question 29

subcutaneous dimorphic fungus

Answer 29

Sporothrix schenckii

Question 30

Identifying feature of paracoccidioides

Answer 30

“mariner’s wheel” in tissue

Question 31

in culture, mold of paracoccidioides is identical to

Answer 31

Blasto (lollipops)

Question 32

3 dermatophytes that produce Macroconidia

Answer 32

Microsporum canis
Microsporum gypseum
Epidermyphyton floccsum

Question 33

Identify microsporum canis

Answer 33

Spindle-shaped macroconidia

Question 34

Identify microsporum gypseum

Answer 34

Oval macroconidia

Question 35

Identify epidermophton floccosum

Answer 35

Club-shaped macroconidia

Question 36

Identify Trichophyton rubrum

Answer 36

“birds on a wire”

red pigment

Question 37

Identify Trichophyton mentagraphytes

Answer 37

Grape-like clusters

Question 38

Identify Trichophyton tonsurans

Answer 38

variability in size and shape of microconidia

Question 39

3 dermatophytes producing microconidia

Answer 39

Trichophyton rubrum
Trichophyton mentagraphytes
Trichophyton tonsurans

Question 40

Dermatophytes that cause destruction of hair shaft

Answer 40

Microsporum canis
Microsporum gypseum
Trichophyton verrucosum

Question 41

Identify A. fumigatus

Answer 41

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

Question 42

Identify A. niger

Answer 42

colony: black front, yellow-grey reverse

Question 43

Identify A. terreus

Answer 43

Colony: cinnamon/buff
Conidiophore: 2 rows of phialides

Question 44

Identify A. flavus

Answer 44

Colony: yellow/green
Coniodiophore: Lollipop

Question 45

Otitis externa

Answer 45

Aspergillus niger

Question 46

Golf-ball conidia

Answer 46

Gliocladium (a hyaline septate mold)

Question 47

Fusiform macroconidia

Answer 47

Fusaria

Question 48

“broom-like” conidia

Answer 48

Penicillum

Question 49

Colonies pigmented on front and back

Answer 49

Dematiaceous molds

Question 50

Conidia of Bipolaris look like

Answer 50

Microsporum gypseum

Question 51

Longer and thinner conidia than Bipolaris

Answer 51

Exserohilum

Question 52

“bottle-brush” conidia

Answer 52

Helminthosproum

Question 53

Dematiaceous molds with transverse and longitudinal septa

Answer 53

Alternaria
Ulocladum
Stemphilium

Question 54

3 principle causes of chromoblastosis

Answer 54

Phialophora
Cladosporum
Fonsecaea

Question 55

Zygomycete with sporangiophores directly over rhizoids

Answer 55

Rhizopus

Question 56

Zygomycete with sporangiophores between rhizoids

Answer 56

Absidia

Question 57

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

Answer 57

Trichoporon is urease + and has “rabbit ears”

Georichum has “hockey stick”

Question 58

Urease + fungi

Answer 58

Cryptococcus
Rhodotorula
Candida krusei
Trichophyton mentagrophytes
Trichosporon

Question 59

Cryptococcus able to cause infection in immunocompetent host

Answer 59

C. gattii

Question 60

White piedra

Answer 60

Trichosporon beigelii

Question 61

Red pigment colonies

Answer 61

Rhodotorula
Penicillium
Fusarium

Question 62

Protothecosis is

Answer 62

Algae

Question 63

Lobomycosis caused by

Answer 63

Loboa loboi, does not grow in colonies

Question 64

Candida resistant to fluconazole

Answer 64

C. krusei (sometimes C. glabrata)

Question 65

Candida resistant to Amphotericin B

Answer 65

C. lusitaniae