8. Clinically Significant Yeasts Flashcards Preview

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Flashcards in 8. Clinically Significant Yeasts Deck (35):
1

Causative agent of thrush

Candida spp.

2

Indicator of immunosuppression

Thrush

3

Most common cause of yeast infection

Candida albicans

4

Germ tube result of Candida albicans

Germ tube positive

5

Sucrose reaction of C. albicans

Sucrose positive

6

Candida spp. that is sucrose negative

C. stellatoidea

7

Second most common Candida spp.

C. tropicalis

8

Macroscopic: creamy, glabrous, with mycelial fringe colonies

C. tropicalis

9

Major cause of nosocomial infections; in indwelling catheters

Candida parapsilosis

10

Rarely isolated as a cause of endocarditis and vaginitis

C. krusei

11

Microscopic: pseudohyphae and elongated blastoconidia, branch-like trees

C. krusei

12

Most commonly found as fungemia

Torulopsis glabrata/Candida glabrata

13

The "working yeast"

Saccharomyces cerevisiae

14

Causative agent of meningitis and pulmonary disease

Cryptococcus spp.

15

A major cause of opportunistic infection in patients with AIDS

Cryptococcus neoformans

16

Found in soil contaminated with pigeon excreta

C. neoformans

17

Responsible for the mucoid appearance of colonies of Cryptococcus spp.

Capsule

18

Stain for Cryptococcus spp. capsule

India ink (negative stain)

19

Today, India ink stain for Cryptococcus is being replaced with

Latex agglutination

20

Latex agglutination detects

Cryptococcal antigen

21

Urease reaction of Cryptococcus spp.

Urease positive

22

Phenol oxidase reaction of C. neoformans

Phenol oxidase positive

23

Media used to detect phenol oxidase production

Caffeic acid agar
Bird seed agar

24

Closely related to Cryptococcus

Rhodotorula spp.

25

Differentiating characteristic of Rhodotorula spp. from Cryptococcus spo.

Rhodotorula spp. are inositol negative

26

Urease reaction of T. beigelii

Urease positive

27

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

Malassezia furfur

28

Most often recovered from environmental samples.

Microscopic: oval, elongated yeast cells, projectile spores

Sporobolomyces spp.

29

Causative agent of Pneumocystis pneumonia

Pneumocystis jiroveci

30

Disease caused by Pneumocystis jiroveci

Pneumocystis pneumonia

31

Commonly used stain for P. jiroveci

GMS

32

Appearance of P. jiroveci in GMS stain

Deflated ball

33

Deflated ball appearance in GMS stain

P. jiroveci

34

Media used for culture of P. jiroveci

Animals

35

Yeast infections are often ____________.

Endogenous/exogenous

Endogenous