Deck 26: Sphingomonas Paucimobilis and Similar Organisms

Question 1

A yellow-pigmented, gram-negative rod on blood agar but not MacConkey that is indole- and urease-negative, oxidase-positive, and positive on wet mount motility testing is most likely

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

Answer 1

D
All these characteristics can be used to describe Sphingomonas.

Question 2

Acidovorax spp.can be described as

A)oxidase-negative, glucose-fermenting, gram-negative bacilli that grow on MacConkey agar.
B)oxidase-positive, glucose-oxidizing, gram-negative bacilli that fail to grow on MacConkey agar.
C)oxidase-positive, glucose-fermenting, gram-negative bacilli that grow on MacConkey agar.
D)oxidase-positive, non-glucose-utilizing, gram-negative bacilli that do not grow on MacConkey agar.

Answer 2

B
The organisms discussed in this chapter are considered together because they usually fail to grow on MacConkey agar, are oxidase-positive, and oxidatively utilize glucose.

Question 3

Sphingomonas spp.can be described as

A)oxidase-negative, glucose-fermenting, gram-negative bacilli that grow on MacConkey agar.
B)oxidase-positive, glucose-oxidizing, gram-negative bacilli that fail to grow on MacConkey agar.
C)oxidase-positive, glucose-fermenting, gram-negative bacilli that grow on MacConkey agar.
D)oxidase-positive, non-glucose-utilizing, gram-negative bacilli that do not grow on MacConkey agar.

Answer 3

B
The organisms discussed in this chapter are considered together because they usually fail to grow on MacConkey agar, are oxidase-positive, and oxidatively utilize glucose.

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 statement best describes the habitats of Acidovorax, Sphingobacterium, and Sphingomonas?

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

Question 6

Sphingobacterium spp.can be described as

A)oxidase-negative, glucose-fermenting, gram-negative bacilli that grow on MacConkey agar.
B)oxidase-positive, glucose-oxidizing, gram-negative bacilli that fail to grow on MacConkey agar.
C)oxidase-positive, glucose-fermenting, gram-negative bacilli that grow on MacConkey agar.
D)oxidase-positive, non-glucose-utilizing, gram-negative bacilli that do not grow on MacConkey agar.