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Elsevier Mycology (RVSP) > 8. Clinically Significant Yeasts > Flashcards

8. Clinically Significant Yeasts Flashcards

1
Q

Causative agent of thrush

A

Candida spp.

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2
Q

Indicator of immunosuppression

A

Thrush

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3
Q

Most common cause of yeast infection

A

Candida albicans

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4
Q

Germ tube result of Candida albicans

A

Germ tube positive

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5
Q

Sucrose reaction of C. albicans

A

Sucrose positive

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6
Q

Candida spp. that is sucrose negative

A

C. stellatoidea

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7
Q

Second most common Candida spp.

A

C. tropicalis

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8
Q

Macroscopic: creamy, glabrous, with mycelial fringe colonies

A

C. tropicalis

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9
Q

Major cause of nosocomial infections; in indwelling catheters

A

Candida parapsilosis

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10
Q

Rarely isolated as a cause of endocarditis and vaginitis

A

C. krusei

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11
Q

Microscopic: pseudohyphae and elongated blastoconidia, branch-like trees

A

C. krusei

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12
Q

Most commonly found as fungemia

A

Torulopsis glabrata/Candida glabrata

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13
Q

The “working yeast”

A

Saccharomyces cerevisiae

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14
Q

Causative agent of meningitis and pulmonary disease

A

Cryptococcus spp.

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15
Q

A major cause of opportunistic infection in patients with AIDS

A

Cryptococcus neoformans

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16
Q

Found in soil contaminated with pigeon excreta

A

C. neoformans

17
Q

Responsible for the mucoid appearance of colonies of Cryptococcus spp.

A

Capsule

18
Q

Stain for Cryptococcus spp. capsule

A

India ink (negative stain)

19
Q

Today, India ink stain for Cryptococcus is being replaced with

A

Latex agglutination

20
Q

Latex agglutination detects

A

Cryptococcal antigen

21
Q

Urease reaction of Cryptococcus spp.

A

Urease positive

22
Q

Phenol oxidase reaction of C. neoformans

A

Phenol oxidase positive

23
Q

Media used to detect phenol oxidase production

A

Caffeic acid agar

Bird seed agar

24
Q

Closely related to Cryptococcus

A

Rhodotorula spp.

25
Q

Differentiating characteristic of Rhodotorula spp. from Cryptococcus spo.

A

Rhodotorula spp. are inositol negative

26
Q

Urease reaction of T. beigelii

A

Urease positive

27
Q

Seen in catheter-related infections in patients on long-term intravenous lipids

A

Malassezia furfur

28
Q

Most often recovered from environmental samples.

Microscopic: oval, elongated yeast cells, projectile spores

A

Sporobolomyces spp.

29
Q

Causative agent of Pneumocystis pneumonia

A

Pneumocystis jiroveci

30
Q

Disease caused by Pneumocystis jiroveci

A

Pneumocystis pneumonia

31
Q

Commonly used stain for P. jiroveci

A

GMS

32
Q

Appearance of P. jiroveci in GMS stain

A

Deflated ball

33
Q

Deflated ball appearance in GMS stain

A

P. jiroveci

34
Q

Media used for culture of P. jiroveci

A

Animals

35
Q

Yeast infections are often ____________.

Endogenous/exogenous

A

Endogenous

Elsevier Mycology (RVSP) (13 decks)

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