Skip to main content

MCQs on Listeria, Corynebacterium, Arthrobacter (gram positive): Medical microbiology (with clinical case)

              MCQs on Listeria, Corynebacterium, Arthrobacter (with clinical case)

1. Which of the following groups is most susceptible to severe Listeria infections?
A) Children
B) Elderly    
C) Teenagers
D) Young adults

2. What is the most common food source associated with Listeria outbreaks?
A) Fresh fruits and vegetables
B) Salty crackers
C) Raw eggs
D) Soft cheeses  

3. Which of the following symptoms is NOT typically associated with Listeria infection?
A) Diarrhea    
B) Fever
C) Nausea
D) Muscle aches

4. What is the recommended temperature for storing refrigerated foods to prevent Listeria growth?
A) 32°F (0°C)
B) 40°F (4°C)   
C) 50°F (10°C)
D) 60°F (15°C)

5. The primary virulence factor in Corynebacterium diphtheriae is:
A) Capsule
B) Endotoxin
C) Exotoxin    
D) Lipopolysaccharide

6. A 7 year old boy is presented to the emergency department because he had been experiencing a sore throat for the past few days. Initially, it started as a mild discomfort, but it had progressively worsened. Over the last 24 hours, he developed difficulty swallowing, and his breathing became increasingly labored. His parents also noticed a grayish-white membrane forming in the back of his throat.
The boy had a history of incomplete immunizations, and he had not received his diphtheria-tetanus-pertussis (DTaP) vaccinations as recommended for her age.
Upon examination, the healthcare provider noted that the boy's throat appeared severely inflamed, with the presence of a thick, grayish-white membrane covering the tonsils and pharynx.
The boy was in respiratory distress, with increased respiratory rate and the use of accessory muscles to breathe. He had a low-grade fever, lymph nodes appeared enlarged.
Based on the clinical presentation and the characteristic grayish-white membrane in the throat, the healthcare team suspected diphtheria. 
Which of the following antibiotic is commonly given for the treatment of diphtheria
a) Azithromycin
b) Ceftriaxone
c) Ketoconazole
d) Penicillin 

7. How can Listeria contamination in food be reduced or prevented?
A) Washing hands thoroughly before eating
B) Cooking meat and poultry thoroughly
C) Avoiding raw seafood
D) All of the above     

8. Which of the following diseases is NOT caused by Corynebacterium species?
A) Acne
B) Diphtheria
C) Skin infections
D) Tetanus 

9. What is the treatment of choice for severe Listeria infections?
A) Antibiotics     
B) Antiviral drugs
C) Antifungal medications
D) No specific treatment is available

10. What is the Gram stain reaction of Listeria monocytogenes and Corynebacterium diphtheriae?
A) Acid fast bacilli
B) Gram-positive bacilli      
C) Gram-negative bacilli
D) Gram-variable

11. Listeria monocytogenes is often misidentified in clinical specimens as:
A) Diphtheroids    
B) Diplococci    
C) Staphylococci
D) Spirochetes

12. Cutaneous diphtheria is often associated with:
A) Eye infections
B) Genital ulcers
C) Open wounds or sores     
D) Respiratory symptoms

13. What is the primary mode of transmission for Listeria monocytogenes in healthy individuals?
A) Airborne transmission
B) Foodborne transmission      
C) Person-to-person contact
D) Waterborne transmission

14. What is the main clinical manifestation of Listeria monocytogenes infection in healthy individuals?
A) Gastrointestinal symptoms    
B) Respiratory infection
C) Skin rash
D) Urinary tract infection

15. Which of the following clinical conditions is often associated with Corynebacterium urealyticum infections?
A) Conjuctivitis
B) Pneumonia
C) Skin abscesses 
D) Urinary tract infections    

16. Which of the following is NOT a characteristic of Listeria monocytogenes?
A) Facultative anaerobic
B) Gram-positive
C) Oxidase-positive    
D) Non-branching rod

17. Which of the following is a common symptom of Listeria monocytogenes foodborne infection?
a) Abdominal cramps and watery diarrhea    
b) Bloody diarrhea with low fever
c) Fever, abdominal cramps, and diarrhea
d) Vomiting and non-blood diarrhea

18. Corynebacterium urealyticum is commonly is considered a potential cause of:
A) Jaundice
B) Kidney stones   
C) Peptic ulcers
D) Tuberculosis

19. What is a common symptom of listeriosis?
a) High fever
b) Rash
c) Stiff neck    
d) Vision problems

20. Which vaccine is typically administered to prevent diphtheria in children as part of routine immunization schedules?
a) MMR vaccine
b) Hepatitis B vaccine
c) DTaP vaccine
d) Influenza vaccine

Answers:
1. B) Elderly
2. D) Soft cheeses  
3. A) Diarrhea
4. B) 40°F (4°C)   
5. C) Exotoxin
6. d) Penicillin    
7. D) All of the above     
8. D) Tetanus  
9. A) Antibiotics
10. B) Gram-positive bacilli  
11. A) Diphtheroids 
12. C) Open wounds or sores  
13. B) Foodborne transmission  
14. A) Gastrointestinal symptoms  
15. D) Urinary tract infections    
16. C) Oxidase-positive   
17. A) Abdominal cramps and watery diarrhea  
18. B) Kidney stones
19. C) Stiff neck   
20. c) DTaP vaccine. Diphtheria-tetanus-pertussis (DTaP) vaccinations is recommended for children to prevent diphtheria.





                                 Source: Centers for Disease Control and Prevention (CDC)

































Comments

Popular posts from this blog

Carbohydrate Metabolism: MCQs and answers on Glycolysis & Gluconeogenesis

                                      MCQ on Glycolysis & Gluconeogenesis 1) Which of the following enzyme is not involved in galactose metabolism? a) Glucokinase b) Galactokinase c) Galactose-1-Phosphate Uridyl transferase d) UDP-Galactose 4- epimerase 2) Which of the following enzyme is defective in galactosemia (type I) - a fatal genetic disorder in infants? a) Glucokinase b) Galactokinase c) Galactose-1-Phosphate Uridyl transferase d) UDP-Galactose 4- epimerase 3) In the liver, the accumulation of which of the following metabolite attenuates the inhibitory of ATP on phosphofructokinase? a) Glucose-6-Phosphate b) Citrate c) Fructose-1,6-Bisphosphate d) Fructose-2,6-Bisphosphate 4) Mutation in which of the following enzymes leads to a glycogen storage disease known as "Tarui’s disease"? a) Glucokinase b) Phosphofructokinase c) Phosphoglucomutase d) Pyruvate Kinase 5) E...

MCQs and Answers on cultivation (culture/incubation), Isolation and Identification of microorganisms: Medical Microbiology

40 plus questions - Multiple Choice Questions on Classification, Culture, and Identification of the microorganisms 1. Which of the following microorganism has the cocci cell shapes and sizes arranged usually in tetrad structures? a)  Streptococcus pneumoniae b)  Staphylococcus aureus c)  Chlamydia trachomatis d)  Neisseria meningitidis 2. What are the different growth morphology and cell structures used for the classification of fungi? Select all the correct answers: a) Yeast b) Mold c) Mycelia d) Protozoa 3. Which of the following media is formulated with additional nutrients to support the growth of fastidious or nutritionally demanding bacteria that may not grow well on basic media? a) Differential media b) Enriched media c) Nutrient agar (media) d) Selective media 4. Which of the following metabolic characteristic is a distinguishing characteristic and identification of colonies of  E. coli ? a) Hydrogen sulfide formation b) Indole Formation c) Lactose fe...

Multiple Choice Questions (MCQs) on Diabetes Mellitus: Pathogenesis, Diagnosis and Treatment

                                        MCQs on Diabetes mellitus 1) Diabetes mellitus is a disorder characterized by hyperglycemia.  Which of the following is not the common characteristic features of type 2 diabetes mellitus ? a) Impaired insulin secretion b) Increased Insulin resistance  c) Diabetic ketoacidosis d) Excessive hepatic glucose production 2) Which of the following are the characteristic features of type 1 diabetes mellitus? a) Type 1 diabetes is caused by an absolute deficiency of insulin. b) Type 1 diabetes is associated with the autoimmune destruction of beta cells.  c) Patients with  uncontrolled type 1 diabetes present with diabetic ketoacidosis d) All of the above   3) Which of the following serum measurements are not used for the diagnosis of diabetes mellitus? a) Fasting blood glucose d) Postprandial blood glucose  c) Insulin ...