MCQ on Vibrios, Campylobacter and Helicobacter (Medical Microbiology)

Multiple Choice Question on Vibrio spp, Campylobacter spp, and Helicobacter spp

1) A watery stool sample was collected from the 5 year old boy who is suffering from diarrhea for 2 days. After the incubation in high pH media containing NaCl, smooth and round colonies appeared. Gram-negative, motile, comma-shaped bacteria were observed after the microscopic examination. Name the possible bacteria?
a) Aeromonas spp
b) E.coli
c) Helicobacter pylori
d) Vibrio cholerae

2) Vibrio cholerae causes Cholera mainly in developing countries that is caused by the ingestion of contaminated water or food. Name the type of diarrheal infection associated with V.cholerae?
a) Acute watery bloody diarrhea
b) Acute watery rice water diarrhea
c) Mild watery rice water diarrhea
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, it has also been associated with a post diarrheal syndrome, the syndrome is known as..........…......?
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 about the cultural requirements for the optimal growth of the 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 CO(10%) with added O2 (5%)

7) What 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 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 is less pathogenic to humans, mostly cause gastroenteritis in humans. Name the other common human infection associated with the bacteria?
a) Peptic ulcer
b) Cellulitis
c) Asthma
d) Gastritis

13) Helicobacter pylori infection is most prevalent in developing countries, which of the following age range are found more susceptible to the disease?
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 that are mostly found in warm coastal areas. What is the common source of transmission of infection in humans?
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

16) Which of the following bacteria is commonly associated with more than 5% gastroenteritis cases each year in the USA?
a) Campylobacter jejuni
b) Campylobacter enteritis
c) Helicobacter pylori
d) Vibrio cholerae

17) Select all the possible risk factors that are associated with H.pylori infections
a) Continuous consumption of contaminated water 
b) Living in developing countries 
c) People who live in warmer regions
d) Young kids who live in crowded area for long time
 




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
16-b) C. enteritis
17- a), b) and c)

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