Deck 21: Nonfermenting and Miscellaneous Gram-Negative Bacilli

Question 1

In what single setting does Stenotrophomonas maltophilia typically produce disease?

A) Community
B) Military barracks
C) Nosocomial
D) College dorms

Answer 1

C

Question 2

The three nonfermenters that make up the majority of isolates routinely seen in clinical laboratories include all the following, except

A) Pseudomonas aeruginosa.
B) Acinetobacter spp.
C) Stenotrophomonas maltophilia.
D) Pseudomonas putida.

Answer 2

D

Question 3

What is the causative agent of glanders?

A) Burkholderia cepacia
B) B. gladioli
C) B. mallei
D) Stenotrophomonas maltophilia

Answer 3

C

Question 4

An H₂S-positive, oxidase-positive, nonfermenter describes

A) Acinetobacter spp.
B) Pseudomonas aeruginosa.
C) Shewanella.
D) Sphingomonas.

Question 5

An oxidase-positive, nonfermentative gram-negative bacillus that characteristically produces dry, wrinkled colonies describes

A) Pseudomonas stutzeri.
B) Pseudomonas luteola.
C) Pseudomonas mendocina.
D) Pseudomonas putida.

Question 6

What Pseudomonas sp. is the nonfermenter that is the leading cause of nosocomial pneumonia and bacteremia?

A) Pseudomonas aeruginosa
B) P. fluorescens
C) P. putida
D) P. mendocina

Question 7

What biochemical test will differentiate nonfermenters from Enterobacteriaceae (except Plesiomonas)?

A) Oxidase
B) Indole
C) Citrate
D) Voges-Proskauer (VP)

Question 8

Which of the following is a virulence factor of Pseudomonas aeruginosa?

A) Endotoxin
B) Exotoxins
C) Capsule
D) All of the above

Question 9

A microbiologist is reading the plates from a sputum culture. On the sheep blood agar (SBA), the microbiologist sees flat spreading colonies with a metallic sheen. On cetrimide agar, a fluorescent green color is seen in the medium with clear colonies. On MacConkey, medium clear colonies are seen that have a fruity or grapelike odor. What is the most likely organism?

A) Pseudomonas fluorescens
B) P. aeruginosa
C) P. putida
D) P. stutzeri

Question 10

What nonfermenter may produce a weak, slow, positive oxidase reaction?

A) Burkholderia cepacia
B) Pseudomonas putida
C) Stenotrophomonas maltophilia
D) P. stutzeri

Question 11

What organism causes melioidosis?

A) Burkholderia mallei
B) B. cepacia
C) B. gladioli
D) B. pseudomallei

Question 12

All of the following are poor prognostic factors associated with Pseudomonas aeruginosa bacteremia, except

A) Septic shock.
B) Granulocytopenia.
C) Septic metastatic lesions.
D) Anemia.

Question 13

Pseudomonas aeruginosa is resistant to all the following antimicrobial agents, except

A) Ampicillin.
B) Chloramphenicol.
C) Trimethoprim-sulfamethoxazole.
D) Fluoroquinolones.

Question 14

Characteristics of most members of the family Flavobacteriaceae

A) weak fermenters.
B) cause of nosocomial infections.
C) ubiquitous in soil and water.
D) All the above

Question 15

All of the following are characteristics of pseudomonads, except

A) thin gram-negative bacilli or coccobacilli.
B) oxidase-positive.
C) indole-positive.
D) resistance to a variety of antimicrobials, such as aminoglycosides, third-generation cephalosporins, penicillins, and fluoroquinolones.

Question 16

What substances do nonfermenters fail to ferment in traditional media?

A) Lipids
B) Carbohydrates
C) Proteins
D) Alkaloids

Question 17

Which plant pathogen may be mistaken for Burkholderia cepacia?

A) Pseudomonas putida
B) Burkholderia gladioli
C) Stenotrophomonas maltophilia
D) P. stutzeri

Question 18

What organism is a common cause of pulmonary disease among individuals with cystic fibrosis?

A) Pseudomonas fluorescens
B) P. aeruginosa
C) P. putida
D) P. mendocina

Question 19

Which gram-negative coccobacilli can appear as gram-positive cocci in smears made from blood culture bottles?

A) Pseudomonas putida
B) Acinetobacter spp.
C) Haemophilus
D) Alcaligenes spp.

Question 20

What organism is associated with pneumonia in patients with cystic fibrosis or chronic granulomatous disease (CGD)?

A) Stenotrophomonas maltophilia
B) Pseudomonas putida
C) Pseudomonas fluorescens
D) Burkholderia cepacia

Question 21

What organism is an opportunistic pathogen that strikes the immunocompromised patient with neutrophil deficits and produces a violet pigment on nonselective agar?

A) Psychrobacter immobilis
B) Chromobacterium violaceum
C) Chryseomonas luteola
D) Paracoccus phenylpyruvicus

Question 22

Members of the Alcaligenes are usually susceptible to all the following antimicrobial agents, except

A) aminoglycosides.
B) ceftazidime.
C) SXT.
D) piperacillin.

Question 23

Elizabethkingae meningosepticum causes all the following diseases, except

A) pneumonia.
B) gastroenteritis.
C) endocarditis.
D) meningitis.

Question 24

Characteristics of Moraxella include

A) oxidase-positive and nonmotile.
B) biochemically inert and aerobic.
C) susceptible to penicillin and opportunistic pathogens.
D) All of the above

Question 25

This bacterium is said to have a fruity or grapelike smell.

A) Staphylococcus aureus
B) Proteus mirabilis
C) Pseudomonas aeruginosa
D) Nocardia sp.

Question 26

A microbiologist is reading the plates from a sputum culture. The culture is from a patient with cystic fibrosis. One organism dominates the blood agar, chocolate, and MacConkey plates. The MacConkey plate shows an organism with a green pigment and a metallic sheen. The probable identification for this organism is

A) Pseudomonas aeruginosa.
B) Serratia marcescens.
C) Chromobacterium violaceum.
D) Prevotella melaninogenica.

Question 27

What is the most common member of the genus Moraxella isolated in the clinical laboratory?

A) M. nonliquefaciens
B) M. osloensis
C) M. lacunata
D) M. catarrhalis

Question 28

Which nonfermenter is considered by government agencies to be a potential bioterrorist agent?

A) Moraxella catarrhalis
B) Burkholderia mallei
C) Pseudomonas putida
D) B. gladioli