Anaerobic Bacteria Success

Question 1

Which of the following is not considered a zoonotic disease?
A. Anthrax
B. Botulism
C. Brucellosis D. Leptospirosis

Answer 1

B

Question 2

A cervical mucosal abscess specimen was senttothelaboratoryforbacteriologic examination. The culture of this sample grew an anaerobic gram-negative bacillus that was inhibited by bile, produced a black pigment, and was negative for
indole production and positive for glucose, sucrose, and lactose fermentation. This isolate would most likely be
A. Bacteroidesfragilis group
B. Bacteroides ureolyticus
C. Porphyromonas gingivalis
D. Prevotella melaninogenica

Answer 2

D

Question 3

The characteristic colony morphology of Actinomyces israelii on solid agar resembles
A. “Medusahead”
B. A molar tooth
C. A fried egg
D. Groundglass

Answer 3

B

Question 4

What is the predominant indigenous flora of the colon?
A. Anaerobic, gram-negative, non-spore- forming bacteria
B. Anaerobic, gram-positive, non-spore- forming bacteria
C. Aerobic, gram-negative, non-spore- forming bacteria
D. Aerobic, gram-positive, spore-forming bacteria

Answer 4

A

Question 5

Which of the following is described as obligately anaerobic gram-positive cocci?
A. Capnocytophaga
B. Peptostreptococcus
C. Propionibacterium
D. Veillonella

Answer 5

B

Question 6

Color Plate 29 • shows the filamentous gram-positive rod recovered from an aspirate of a closed chest abscess. It grew only under anaerobic conditions and was not acid-fast. What is the most likely presumptive identification of the isolate seen?
A. Actinomyces israelii
B. Bacteroides fragilis
C. Clostridium septicum
D. Propionibacterium acnes

Answer 6

A

Question 7

The diagnosis of pseudomembranous colitis (Clostridium difficile associated disease) is often made by
A. Serology
B. Culturing blood specimens
C. Assays to detect toxin in stool
D. Acid-fast stain of fecal material

Answer 7

C

Question 8

The anaerobic, gram-negative, curved, motile bacilli associated with bacterial vaginosis belong to the genus
A. Actinomyces
B. Bifidobacterium
C. Lactobacillus
D. Mobiluncus

Answer 8

D

Question 9

The majority of the gram-positive, non- spore-forming, anaerobic bacilli isolated from clinical material will be
A. Bifidobacterium dentium
B. Capnocytophagia ochracea
C. Eubacterium limosum
D. Propionibacterium acnes

Answer 9

D

Question 10

242. The gram-negative, non-spore-forming, anaerobic bacillus frequently implicated in serious clinical infections such as brain and lung abscesses is
     A. Bacteroides urealyticus
     B. Eubacterium lentum
     C. Fusobacterium nucleatum
     D. Peptostreptococcus anaerobius

Answer 10

C

Question 11

Which one of the following is a non-spore-forming, gram-positive, anaerobic bacillus?
A. Clostridium
B. Fusobacterium
C. Propionibacterium
D. Veillonella

Answer 11

C

Question 12

Whichofthefollowingorganismsisnot gram-positive?
A. Eubacterium lentum
B. Bifidobacterium dentium
C. Propionibacterium acnes
D. Suttonella wadsworthensis

Answer 12

D

Question 13

245. A tube of semisolid medium that contains resazurin appears pink. What does this indicate?
     A. Acid environment
     B. Alkaline environment
     C. Motility
     D. Presence of oxygen

Answer 13

D

Question 14

IdentifytheFusobacteriumsp.considered to be the most frequent isolate recovered from clinical infections.
A. F. varium
B. F. nucleatum
C. F. mortiferum
D. F. necrophorum

Answer 14

B

Question 15

Which anaerobic, gram-negative rod can be presumptively identified by its Gram stain morphology, and inhibition by bile and a 1-jag kanamycin disk?
A. Bacteroidesfragilis group
B. Eubacterium lentum
C. Fusobacterium nucleatum
D. Porphyromonasgingivalis

Answer 15

C

Question 16

Which of the following tests is most appropriate for the presumptive identifica- tion of Prevotella melaninogenica?
A. SPS sensitivity test
B. Nagler test
C. Cytotoxin assay
D. Fluorescence test

Answer 16

D

Question 17

Whichofthefollowingtestsismost appropriate for the identification of Clostridium difficile?
A. SPS sensitivity test
B. Nagler test
C. Cytotoxin assay
D. Fluorescence test

Answer 17

C

Question 18

254. Which of the following statements is true regarding Clostridium perfringens ?
     A. There are five serologic types.
     B. Spores are terminally located.
     C. Alpha-toxin is produced by all strains.
     D. Spores are readily seen in laboratory
     media

Answer 18

C

Question 19

260. Which of the following tests is most appropriate for the presumptive identifica- tion of Peptostreptococcus anaerobius?
     A. SPSdisk
     B. Colistindisk
     C. Kanamycindisk
     D. Vancomycindisk

Answer 19

A

Question 20

A curved appearance on Gram stain is characteristic of which of the following?
A. Actinomyces israelii
B. Clostridium septicum
C. Fusobacterium nucleatum
D. Propionibacterium acnes

Answer 20

C

Question 21

Pumlent material from a cerebral abscess was submitted to the laboratory for smear and culture. On direct Gram stain, gram- positive cocci in chains and gram-negative bacilli with pointed ends were seen. Plates incubated aerobically exhibited no growth at 24 hours. On the basis of the organisms seen on the smear, what is the most likely presumptive identification of the etiologic anaerobic agents?
A. Veillonella sp. and Clostridium sp.
B. Eubacterium sp. and Veillonella sp.
C. Peptostreptococcus sp. and Nocardia sp.
D. Fusobacterium sp. andPeptostreptococcus sp.

Answer 21

D

Question 22

Aspiration of vomitus can lead to pneumonia. Which of the following would not be a likely causative agent in aspira- tion pneumonia?
A. Bacteroides gracilis
B. Mobiluncus sp.
C. Porphyromonas sp.
D. Prevotella melaninogenica

Answer 22

B