Medical Microbiology: Vibrios, Campylobacter and Helicobacter MCQ

Multiple Choice Question on Vibrios, Campylobacters, Helicobacter

1) A stool specimen from 5 years old child is cultured in selective media having high pH concentration. After the incubation, colonies appear smooth and round and identified as a comma-shaped, gram-negative, motile bacteria. Name the bacteria isolated?
a) Aeromonas spp
b) Pseudomonas aeruginosa
c) Streptococcus pyogens
d) Vibrio cholerae

2) Vibrio cholerae causes Cholera and mostly occurs in developing countries, symptoms include diarrhea and vomiting within 2-3 days after the ingestion of contaminated water or food. Name the type of diarrhea caused by V.cholerae?
a) Acute watery diarrhea with blood
b) Acute watery diarrhea resembling rice water
c) Mild watery diarrhea resembling rice water
d) Acute watery diarrhea with no blood

3)What is the most common food that causes foodborne gastro-enteritis by Vibrio parahaemolyticus?
a) Chicken
b) Fish
c) Oysters
d) Rice

4) Which of the following statements is/are not correct about Aeromonas spp and Plesiomonas spp?
a) Both are oxidase positive
b) They can be found in freshwater and soil
c) They are gram-negative rods
d) Grow well on TCBS (thiosulphate citrate bile salt) media

5) Campylobacter jejuni is one of the most common causes of food poisoning, which also has been associated with post diarrheal syndrome, the syndrome is called..........…......?
a) Toxic shock syndrome
b) Guillain-Barre syndrome
c) Short bowel syndrome
d) Rett syndrome

6) Campylobacter jejuni is a microaerophilic bacteria, which of the following statement is true for the culture of this bacteria?
a) An atmosphere of increased O2 (10%) with added CO2 (5%)
b) An atmosphere of reduced O2 (5%) with added CO2 (10%)
c) An atmosphere of reduced CO2 (5%) with added CO2 (10%)
d) An atmosphere of increased CO2(10%) with added O2 (5%)

7) What is/are not the growth characteristics of Campylobacter spp? Select from all the options given below.
a) Oxidase and catalase positive
b) Produce H2S
c) Ferment carbohydrates
d) Have darting motility

8) Helicobacter pylori is associated with all of the following, EXCEPT?
a) Malt lymphoma
b) Gastric carcinoma
c) Peptic ulcer
d) Burkitt lymphoma

9) Which one of the following virulence factors may be associated with the pathogenesis of infection caused by Helicobacter pylori?
a) Flagella
b) Lipopolysaccharides
c) Exotoxins
d) Endotoxins

10) Which one of these is not the common laboratory tests for the identification of Helicobacter pylori?
a) Biopsy test
b) Urease breath test
c) Stool antigen test
d) Urine test

11) Which of the following biotypes of Vibrio cholerae is prevalent in developing countries?
a) EL Tor
b) Classic
c) Biotype 0139
d) Biotype 139

12) Aeromonas hydrophila mostly causes infections to fish and amphibians and less pathogenic to humans, one of the most common infection in human is gastroenteritis. What is the other common human disease caused by bacteria?
a) Peptic ulcer
b) Cellulitis
c) Asthma
d) Gastritis

13) Helicobacter pylori infection is most prevalent in developing countries, in what age people the chances of infection is the highest?
a) 10 to 30
b) 30 to 50
c) 60 and above
d) Infant

14) Vibrio vulnificus and V. parahaemolyticus both gram-negative, motile bacteria are mostly found in warm coastal areas. What is/are the common source through which these bacteria can be transferred to human and cause infections?
a) Water
b) Oysters
c) Shellfish
d) All of the above

15) …............... is less likely to cause gastroenteritis or diarrheal disease in humans.
a) Vibrio spp
b) Salmonella spp
c) Plesiomonas spp
d) Campylobacter spp

Multiple Choice Answers Review
1-d) Vibrio cholera
2-b) Acute watery diarrhea resembling rice water
3-c) Oysters
4-d) Grow well on TCBS (thiosulphate citrate bile salt) media
5-b) Guillain-Barre syndrome
6-b) An atmosphere of reduced O2 (5%) with added CO2 (10%)
7- c) Ferment carbohydrates
8-d) Burkitt lymphoma
9-d) Endotoxins
10-d) Urine test
11- a) EL Tor
12-b) Cellulitis
13-c) 60 and above
14-d) All of the above
15-c) Plesiomonas spp