Question 1

Which partially acid-fast,gram-positive,and branching filamentous bacteria appear dry and white to creamy to orange with rhizoid edges on routine agar and are urea-positive and resistant to lysozyme?

Accepted Answer

A)  Tsukamurella
B)  Gordonia
C)  Actinomadura
D)  Dermatophilus A

Question 2

A chronic,granulomatous infection of subcutaneous tissues,which is caused by aerobic actinomycetes resulting in tissue swelling and draining sinus tracts,is referred to as:

Accepted Answer

A)  actinomycetoma.
B)  infectious granulomas.
C)  lymphocytoma.
D)  Actinomadura. A

Question 3

Non-acid-fast aerobic actinomycetes include:

Accepted Answer

A)  Nocardia.
B)  Rhodococcus.
C)  Streptomyces.
D)  Gordona. C

Question 4

The organism that has been most commonly associated with human disease,particularly in patients who are immunocompromised,such as those infected with human immunodeficiency virus (HIV),is:

Accepted Answer

A)  Rhodococcus.
B)  Gordonia.
C)  Tsukamurella.
D)  Streptomyces.

Question 5

Nocardia spp.cause which of the following types of infections in individuals who are immunocompromised?

Accepted Answer

A)  Mycetoma
B)  Lymphocutaneous infections
C)  Skin abscesses or cellulites
D)  Invasive pulmonary infections

Question 6

Nocardia spp.form branched filaments that extend into the air that are called _____ hyphae.

Accepted Answer

A)  surface
B)  substrate
C)  aerial
D)  topical

Question 7

Nocardia spp.form branched filaments that extend along the agar surface,which are called _____ hyphae.

Accepted Answer

A)  surface
B)  substrate
C)  aerial
D)  topical

Question 8

Which organisms should be used to run quality control for acid-fast stains?

Accepted Answer

A)  Nocardia and Rhodococcus
B)  Streptomyces and Actinomadura
C)  Dermatophilus and Nocardiopsis
D)  Nocardia and Streptomyces

Question 9

Partially acid-fast aerobic actinomycetes include:

Accepted Answer

A)  Nocardia.
B)  Mycobacteria.
C)  Streptomyces.
D)  Actinomadura.

Question 10

The group of bacteria that can be described as being normal inhabitants of soil and water and primarily responsible for the decomposition of plant material is:

Accepted Answer

A)  Rhodococcus.
B)  Nocardia.
C)  Gordonia.
D)  Tsukamurella.

Exam 17: Nocardia, Streptomyces, Rhodococcus, Oerskovia, and Similar Organisms