Deck 20: Vibrio, Aeromonas, Plesiomonas, and Campylobacter Species

Question 1

What organism may play a role in Guillain-Barré syndrome (GBS)?

A)Helicobacter
B)Aeromonas
C)Campylobacter
D)Plesiomonas

Answer 1

C
Strong evidence suggests that Campylobacter infection plays a role in GBS, an autoimmune disorder characterized by paralysis of the peripheral nervous system.Many patients with GBS test positive for antibodies to Campylobacter.

Question 2

What do aeromonad colonies look like on cefsulodin-irgasan-novobiocin (CIN) agar?

A)Purple colonies
B)Clear colonies
C)Green colonies
D)Pink colonies

Answer 2

D
On CIN medium, either the standard CIN formulation for enteric Yersinia or the modified CIN II, Aeromonas will form pink-centered colonies from the fermentation of mannitol, with an uneven, clear apron-resembling Yersinia enterocolitica.However, an oxidase test performed on SBA colonies will easily separate the oxidase-positive aeromonads from the oxidase-negative Yersinia.

Question 3

Aeromonads are generally susceptible to all these antibiotics except:

A)trimethoprim-sulfamethoxazole.
B)ampicillin.
C)aminoglycosides.
D)quinolones.

Answer 3

B
As a genus, aeromonads are nearly uniformly resistant to penicillin, ampicillin, and carbenicillin except the susceptibility of Aeromonas trota.Otherwise, aeromonads are generally susceptible to trimethoprim-sulfamethoxazole, aminoglycosides, and quinolones.

Question 4

What two biochemical tests help distinguish Aeromonas spp.from other enterics?

A)Oxidase and indole
B)Oxidase and Simmon's citrate
C)Simmon's citrate and indole
D)Voges-Proskauer (VP) and indole

Question 5

Infections with Vibrio spp.can be contracted in all of the following situations except:

A)increased travel to either coastal or cholera-endemic areas.
B)increased consumption of seafood (particularly uncooked).
C)greater numbers of Vibrio spp.in the environment.
D)increased use of recreational water facilities.

Question 6

What Vibrio species is most infrequently isolated in the laboratory?

A)Vibrio alginolyticus
B)V.parahaemolyticus
C)V.cholerae
D)V.vulnificus

Question 7

What species of Aeromonas is the most frequently associated with gastrointestinal infections?

A)A.hydrophila
B)A.caviae
C)A.veronii
D)A.sobria

Question 8

Plesiomonas spp.cause all of the following clinical types of gastroenteritis except:

A)the more common watery or secretory diarrhea.
B)a second subacute or chronic disease that lasts between 14 days and 2 to 3 months.
C)a more invasive, dysenteric form that resembles colitis.
D)a hemorrhagic diarrhea.

Question 9

Aeromonads have been implicated in all of the following diseases except:

A)osteomyelitis.
B)meningitis.
C)pneumonia.
D)otitis.

Question 10

How is cholera treated?

A)Tetracycline
B)Copious amounts of intravenous fluids
C)Aminoglycosides with a large amount of intravenous fluids
D)Rest and cold showers

Question 11

Which of the following is a curved, gram-negative rod that grows on TCBS agar?

A)Vibrio
B)Campylobacter
C)Clostridium
D)Fusobacterium

Question 12

What is the name of the organism that causes the disease cholera?

A)Vibrio furnissii
B)V.cholerae
C)V.vulnificus
D)V.parahaemolyticus

Question 13

When collecting specimens that may contain Campylobacter spp.bacteria, what transport medium should they be placed in, if a delay in transport is possible?

A)Buffered glycerol-saline
B)Regan-Lewis
C)Aimes
D)Cary-Blair

Question 14

What organism is the most common cause of bacterial gastroenteritis worldwide?

A)Campylobacter jejuni
B)C.fetus
C)C.lari
D)C.coli

Question 15

All of the following characteristics describe the genus Plesiomonas except:

A)ferments glucose.
B)motile.
C)oxidase negative.
D)facultative anaerobes.

Question 16

A patient is brought to the emergency department with a severe case of gastroenteritis.The patient experienced gastrointestinal upset after eating raw oysters.What organism can be the culprit for this patient's condition?

A)Vibrio trota
B)V.parahaemolyticus
C)V.cholerae
D)V.vulnificus

Question 17

What is the name of the organism that is strongly associated with gastric, peptic, and duodenal ulcers, as well as GI carcinoma?

A)Campylobacter jejuni
B)Helicobacter pylori
C)C.curvus
D)H.rectus

Question 18

What disease manifests in acute cases as a severe gastroenteritis, accompanied by vomiting followed by diarrheic stools that are described as rice water and occur 10 to 30 times a day?

A)Cholera
B)Typhoid
C)Dysentery
D)Food poisoning

Question 19

What is the name of the organism that is responsible for "summer diarrhea" in Japan?

A)Vibrio cholerae
B)V.vulnificus
C)V.parahaemolyticus
D)V.trota

Question 20

All of the following are biochemical characteristics of Vibrio spp.except:

A)ferments glucose.
B)reduces nitrate to nitrite.
C)halophilic.
D)oxidase negative.

Question 21

How is Helicobacter pylori presumptively identified?

A)A culture of a gastric biopsy
B)A culture of gastric scrapings
C)A rapid oxidase test done on gastric scrapings
D)A rapid urease test done on a gastric biopsy

Question 22

A microbiologist is working the miscellaneous bench reading stool cultures.The campy plate from a culture has growth on the plate that was incubated at 42° C.The colonies are nonhemolytic, moist, "runny looking," and spreading.The Gram stain shows tiny gram-negative rods with some S-shapes and seagull-wing shapes.What is growing on the plate?

A)Aeromonas
B)Helicobacter
C)Campylobacter
D)Acinetobacter

Question 23

What type of an atmosphere do campylobacters require for growth?

A)Microaerophilic and capnophilic
B)Anaerobic and moist
C)Capnophilic and halophilic
D)Microaerophilic and high nitrogen content

Question 24

Campy-BAP contains:

A)Brucella agar base, 10% sheep red blood cells, vancomycin, trimethoprim, polymyxin B, amphotericin B, and cephalothin.
B)Columbia agar base, 5% sheep red blood cells, erythromycin, spectinomycin, Diflucan, and ampicillin.
C)Brucella agar base, 5% sheep red blood cells, Zithromax, sulfamethoxazole, nystatin, amphotericin B, and imipenem.
D)Columbia agar base, glycerol, L-cysteine, hemin, streptomycin, amphotericin B, and gentamicin.

Question 25

What temperature is an optimal growth temperature for Campylobacter jejuni?

A)35° C
B)42° C
C)25° C
D)60° C

Question 26

What is the drug of choice for treating intestinal campylobacteriosis?

A)Erythromycin
B)Gentamicin
C)Vancomycin
D)Imipenem

Question 27

What organism has a microscopic morphology of tiny, curved, gram-negative rods, with S-shapes or seagull-wing shapes on Gram stain?

A)Helicobacter
B)Campylobacter
C)Haemophilus
D)Acinetobacter