Deck 27: Medically Significant Fungi

Question 1

Identify the following:

A) Microsporum canis
B) Sporothrix schenckii
C) Aspergillus fumigatus
D) Trichophyton mentagrophytes

Answer 1

D
This species makes both microconidia and macroconidia.Microconidia are primarily globose but may appear tear-shaped and measure 2.5 to 4 mm.Microconidia are primarily found in clusters described as grapelike or engrape.Macroconidia are thin walled,smooth,and cigar shaped with four to five cells separated by parallel cross-walls.These conidia measure about 7 mm by 20 to 50 mm and are produced singly on undifferentiated hyphae.CDC PHIL # 3213

Question 2

Identify the following:

A) Mucor spp.
B) Microsporum spp.
C) Sporothrix schenckii
D) Malassezia furfur

Answer 2

A
As with other Zygomycetes,Mucor has been implicated in rhinocerebral zygomycosis in addition to disseminated disease.Sporangiospores are formed in sporangia on erect sporangiophores.Rhizoids,typical of some Zygomycetes,are not found in Mucor.The sporangia frequently remain intact,as opposed to Rhizopus spp.,in which the sporangia typically collapse.CDC PHIL # 3961

Question 3

Identify the following:

A) Trichophyton rubrum
B) Epidermophyton audouinii
C) Fonsecaea compacta
D) Microsporum gypseum

Answer 3

D
The fusiform,moderately thick-walled conidia measure 8 to 15 mm by 25 to 60 mm and may have as many as six cells.In some isolates,the distal end of the macroconidium may bear a thin,filamentous tail.Abundant macroconidia and microconidia produced by most isolates of this species result in a powdery,granular appearance on colony surfaces.CDC PHIL # 3939

Question 4

Identify the following:

A) Mucor spp.
B) Rhizopus spp.
C) Alternaria spp.
D) Curvularia spp.

Question 5

All of the following are examples of dimorphic fungi EXCEPT:

A) Candida albicans
B) Coccidioides immitis
C) Histoplasma capsulatum
D) Sporothrix schenckii

Question 6

Identify the following:

A) Mucor spp.
B) Penicillium spp.
C) Geotrichum spp.
D) Alternaria spp.

Question 7

Identify the following:

A) Malassezia furfur
B) Trichophyton schoenleinii
C) Microsporum audouinii
D) Trichophyton rubrum

Question 8

What is the causative agent of tinea nigra?

A) Microsporum canis
B) Trichosporon beigelii
C) Piedraia hortae
D) Phaeonnellomyces werneckii

Question 9

Identify the following:

A) Sporothrix schenckii
B) Fusarium spp.
C) Mucor spp.
D) Geotrichum spp.

Question 10

Identify the following:

A) Candida albicans
B) Alternaria spp.
C) Mucor spp.
D) Pseudoallescheria boydii

Question 11

Identify the following:

A) Histoplasma capsulatum
B) Toxoplasma gondii
C) Microsporum tonsurus
D) Paracoccidioides brasiliensis

Question 12

What is the causative agent of black piedra?

A) Microsporum canis
B) Trichosporon beigelii
C) Piedraia hortae
D) Sporothrix schenckii

Question 13

Identify the following:

A) Trichosporon boydii
B) Sporothrix schenckii
C) Trichophyton rubrum
D) Microsporum canis

Question 14

Identify the following:

A) Malassezia furfur
B) Mucor spp.
C) Phaeoannellomyces werneckii
D) Microsporum canis

Question 15

Identify the following:

A) Rhizopus spp.
B) Mucor spp.
C) Histoplasma capsulatum
D) Aspergillus spp.

Question 16

Identify the following:

A) Malassezia furfur
B) Trichosporon beigelii
C) Microsporum audouinii
D) Trichophyton rubrum

Question 17

A patient with very pale patches on his arms and legs is examined at his doctor's office.His doctor orders a fungal culture.The fungus shows a spaghetti-and-meatball appearance on the direct smear.What organism is it?

A) Microsporum canis
B) Malassezia furfur
C) Trichophyton rubrum
D) Epidermophyton floccosum

Question 18

Identify the following:

A) Trichophyton spp.
B) Mucor spp.
C) Microsporum canis
D) Blastomyces dermatitidis

Question 19

Identify the following:

A) Cladosporium spp.
B) Candida spp.
C) Coccidioides immitis
D) Cryptococcus neoformans

Question 20

Identify the following:

A) Coccidioides immitis
B) Blastomyces dermatitidis
C) Cryptococcus neoformans
D) Candida albicans

Question 21

What organism is found in the San Joaquin Valley region of California?

A) Sporothrix schenckii
B) Penicillium marneffei
C) Coccidioides immitis
D) Paracoccidioides brasiliensis

Question 22

What organism is one of the primary opportunistic infections in AIDS patients?

A) Pneumocystis jiroveci
B) Phaeoannellomyces werneckii
C) Coccidioides immitis
D) Paracoccidioides brasiliensis

Question 23

What organism frequently presents in fungus balls?

A) Fonsecaea compacta
B) Penicillium marneffei
C) F. pedrosoi
D) Aspergillus fumigatus

Question 24

For potassium hydroxide (KOH)to work properly,what is done to speed up the dissolution of the keratin and skin layers?

A) Mix gently.
B) Let the slide sit for 30 minutes before reading.
C) Heat gently, then cool.
D) Let sit under an ultraviolet light for 20 minutes.

Question 25

Chromoblastomycosis is caused by all the following organisms EXCEPT:

A) Fonsecaea compacta
B) Penicillium marneffei
C) Fonsecaea pedrosoi
D) Phialophora verrucosa

Question 26

All of the following organisms cause cutaneous mycoses EXCEPT:

A) Sporothrix schenckii
B) Trichophyton beigelii
C) Microsporum canis
D) Epidermophyton floccosum