Deck 22: Chryseobacterium, Sphingobacterium, and Similar Organisms

Question 1

Quality control was performed to determine the validity of urea agar.S.multivorum and E.meningoseptica were used,which yielded positive for S.multivorum and negative for E.meningoseptica.Which one of the following statements explains this discrepancy?

A)The urea agar is most likely expired.
B)The pH is off on the urea agar.
C)These two organisms are poor choices for quality control because they are both urea positive.
D)No discrepancy is present;the results are valid.

Answer 1

D
S.multivorum is urea positive,whereas E.meningoseptica is urea negative;therefore,the results are correct and valid.

Question 2

Which organism's virulence is due to protease and gelatinase production,which causes the destruction of host cells and tissues?

A)Bergeyella zoohelcum
B)E.meningoseptica
C)Chryseobacterium indologenes
D)Agrobacterium spp.

Answer 2

B
E.meningoseptica,the species most often associated with human infections,can be encapsulated or produce proteases and gelatinases that destroy host cells and tissues.

Question 3

Neonates and individuals who are immunocompromised are at risk for developing meningitis if they contract which organism?

A)Elizabethkingia meningoseptica
B)Myroides odoratus
C)Sphingobacterium spp.
D)Centers for Disease Control and Prevention (CDC)group EO-3

Answer 3

A
This life-threatening infection,which may be accompanied by bacteremia,originally gained attention because it occurred in neonates.However,E.meningoseptica meningitis can also occur in adults who are immunocompromised.The organism has been implicated in hospital-based outbreaks of both meningitis and pneumonia.

Question 4

Decontamination strategies used for potable water and the control of E.meningoseptica are similar to those utilized for which organism?

A)Streptococcus pneumoniae
B)Staphylococcus aureus
C)Listeria monocytogenes
D)Legionella spp.

Question 5

Which two organisms should be used for quality control purposes to determine the validity of the indole reagent?

A)E.meningoseptica and Empedobacter brevis
B)Chryseobacterium spp.and E.meningoseptica
C)E.meningoseptica and Sphingobacterium multivorum
D)Agrobacterium group and Sphingobacterium spiritivorum

Question 6

The natural habitat of the bacterium Sphingobacterium is:

A)environment.
B)animal oral and respiratory flora.
C)environment,cold climates.
D)human normal flora.

Question 7

On Gram stain,which organism appears thin in the center and thicker at the ends?

A)Agrobacterium yellow group
B)CDC groups EO-3 and EO-4
C)E.meningoseptica
D)E.brevis

Question 8

A patient with a bacteremia identified as E.meningoseptica infection was placed on intravenous penicillin;however,the patient did not improve after 5 days.Which one of the following statements explains these findings?

A)The dose was abbreviated and therefore did not have time to work.
B)The patient is most likely allergic to penicillin and is not responding.
C)Penicillin is ineffective against this organism.
D)An aminoglycoside should be given along with the penicillin to increase its effects.

Question 9

This organism is often associated with infections in patients with leukemia or lymphoma,as well as preterm infants:

A)S.multivorum
B)C.indologenes
C)E.meningoseptica
D)Bergevella zoohelicum

Question 10

A patient receiving hemodialysis began spiking a fever shortly after his treatment.Blood cultures were drawn and grew out the following gram-negative rods that were indole positive with variable results for urea,nitrate reduction,and gelatin.The organism is most likely:

A)E.meningoseptica.
B)E.brevis.
C)CDC group O-1.
D)Chryseobacterium spp.

Question 11

The natural habitat of Chryseobacterium sp.can best be described as the:

A)mucous membranes of animals.
B)gastrointestinal tract of humans and other animals.
C)natural environment.
D)genitourinary tract of animals.

Question 12

Which organism is indole and gelatin positive but does not have the ability to oxidize mannitol?

A)S.multivorum
B)CDC group O-1
C)E.brevis
D)E.meningoseptica