Deck 30: Actinobacillus, Kingella, Cardiobacterium, Capnocytophaga, and Similar Organisms

Question 1

Kingella spp.can be distinguished from Neisseria spp.by

A)its negative test for catalase.
B)its positive test for lactose fermentation.
C)its positive test for catalase.
D)its negative test for oxidase.
E)All of the above are correct.

Answer 1

A
Kingella spp. are catalase-negative, which helps separate them from Neisseria spp., with which they are sometimes confused. K. denitrificans may be mistaken for Neisseria gonorrhoeae when isolated from modified Thayer-Martin agar. Nitrate reduction is a key test in differentiating K. denitrificans from N. gonorrhoeae, which is nitrate-negative.

Question 2

Actinobacillus actinomycetemcomitans can be distinguished from Capnocytophaga hominis by

A)its negative test for catalase.
B)its positive test for lactose fermentation.
C)its positive test for catalase.
D)its negative test for indole.
E)All of the above are correct.

Answer 2

D
A. actinomycetemcomitans differs from Capnocytophaga hominis in being indole-negative and catalase-positive.

Question 3

Actinobacillus actinomycetemcomitans can be distinguished from H.aphrophilus by

A)its negative test for catalase.
B)its positive test for lactose fermentation.
C)its positive test for catalase.
D)its negative test for oxidase.
E)All of the above are correct.

Answer 3

C
A. actinomycetemcomitans, the most frequently isolated of the actinobacilli, can be distinguished from H. aphrophilus by its positive test for catalase and negative test for lactose fermentation.

Question 4

Actinobacillus actinomycetemcomitans can be distinguished from Kingella spp by

A)its negative test for catalase.
B)its positive test for lactose fermentation.
C)its positive test for catalase.
D)its negative test for oxidase.
E)All of the above are correct.

Question 5

Of the following organisms, which is among the HACEK group of organisms that cause slowly progressive bacterial endocarditis?

A)Capnocytophaga gingivalis
B)Sphingomonas paucimobilis
C)Weeksella virosa
D)Actinobacillus actinomycetemcomitans
E)All of the above are correct.

Question 6

Capnocytophaga hominis can be distinguished from Haemophilus aphrophilus by

A)its negative test for catalase.
B)its positive test for lactose fermentation.
C)its positive test for indole.
D)its negative test for oxidase.
E)All of the above are correct.

Question 7

Of the following organisms, which can be described as slow or poorly growing, are capnophiles, and will not grow on MacConkey agar?

A)Actinobacillus actinomycetemcomitans
B)Kingella denitrificans
C)Cardiobacterium hominis
D)Capnocytophaga gingivalis
E)All of the above are correct.

Question 8

Which of the following bacterial species is a nonvirulent part of human and animal flora and is transmitted to humans during trauma such as bites or dental work?

A)Sphingomonas paucimobilis
B)Weeksella virosa
C)Pasteurella multocida
D)Actinobacillus
E)All of the above are correct.