Deck 26: Sphingomonas Paucimobilis and Similar Organisms

Question 1

When performing quality control on motility media, which of the following organisms should be used?

A) Acidovorax facilis and Sphingomonas spp.
B) Centers for Disease Control and Prevention (CDC) group IIc and CDC group IIe
C) CDC group Iii and Sphingobacterium mizutaii
D) CDC group IIh and Acidovorax facilis

Answer 1

D
CDC group IIh and Acidovorax facilis are two organisms that are negative and positive, respectively, for motility.

Question 2

Although no definitive guidelines are available for the treatment of Sphingomonas paucimobilis infections, which antibiotic appears to have potential activity against this organism?

A) Penicillin
B) Trimethoprim-sulfamethoxazole combination
C) Flagyl
D) Imipenem

Answer 2

B
Antimicrobic susceptibility indicates that S.paucimobilis is susceptible to tetracycline, chloramphenicol, trimethoprim-sulfamethoxazole combination, and aminoglycosides.

Question 3

A yellow-pigmented, gram-negative rod on blood agar that is oxidase-positive, motile by wet mount, and has the ability to oxidize glucose, xylose, and sucrose is most likely which of the following?

A) Treponema
B) Leptospira
C) Borrelia
D) Sphingomonas

Answer 3

D
All these characteristics can be used to describe Sphingomonas.

Question 4

Oxidase-positive, glucose-positive, (oxidatively)gram-negative bacilli that cannot grow on MacConkey agar include:

A) Pseudomonas.
B) Vibrio.
C) Stenotrophomonas.
D) Sphingomonas.

Question 5

Which of the following statements best describes the habitats of Acidovorax, Sphingobacterium, and Sphingomonas?

A) Habitats are limited to the upper respiratory tract of various mammals.
B) Habitats are unknown.
C) Habitats are limited to the soil and water environment.
D) Habitats are limited mostly to water sources.