

MCQOPTIONS
This section includes 51 Mcqs, each offering curated multiple-choice questions to sharpen your Staplylococcus knowledge and support exam preparation. Choose a topic below to get started.
1. |
Which drug is used for the treatment of anthrax? |
A. | erythromycin |
B. | penicillin |
C. | tetracycline |
D. | ampicillin |
Answer» C. tetracycline | |
2. |
Which of the following is a major virulence factor of Streptococcus pneumoniae? |
A. | polysaccharide capsule |
B. | M protein |
C. | streptolysin O |
D. | streptolysin S |
Answer» B. M protein | |
3. |
Puerperal fever is a streptococcal infection of the ______________ |
A. | kidney |
B. | skin |
C. | uterus |
D. | heart |
Answer» D. heart | |
4. |
All are true about Streptococcus except: |
A. | M-protein is responsible for the production of mucoid colonies |
B. | M-protein is responsible for virulence |
C. | Mucoid colonies are virulent |
D. | No resistance to penicillin has been reported |
Answer» B. M-protein is responsible for virulence | |
5. |
A person from the village is complaining about the development of pustules. Extract from pus has shown gram-positive cocci, showing hemolysis, catalase -ve, identified as a group of streptococci. The following test is used:
|
A. | Bacitracin sensitivity |
B. | Novobiocin sensitivity |
C. | Optochin sensitivity |
D. | Hemolysis |
Answer» B. Novobiocin sensitivity | |
6. |
Which component of St.pyogenes has cross-reactivity with the synovium of humans? |
A. | Capsular hyaluronic acid |
B. | Cell proteins |
C. | Group A carbohydrate antigens |
D. | Peptidoglycan |
Answer» B. Cell proteins | |
7. |
Eight months after prosthetic valve replacement, the most common organism causing infective endocarditis is: |
A. | Staph.epidermidis |
B. | Strep.Viridans |
C. | Staph.aureus |
D. | HACEK |
Answer» B. Strep.Viridans | |
8. |
A boy with skin ulcer on leg, culture revealed beta hemolysis. School physician said that similar hemolysis was seen in the organism from a sore throat, what is the similarity between both? |
A. | A protein is the same for both |
B. | C carbohydrate antigen is different |
C. | C carbohydrate antigen is the same |
D. | Strain causing both are same |
Answer» D. Strain causing both are same | |
9. |
In the case of neonatal meningitis, the etiologic bacteria was found to have properties of -hemolysis, bacitracin resistance, CAMP positive. Which of the following is the most likely causative agent? |
A. | S.pyogenes |
B. | S.agalactiae |
C. | S.pneumoniae |
D. | E.faecalis |
Answer» C. S.pneumoniae | |
10. |
Streptococci causing dental caries: |
A. | Streptococci equisimilis |
B. | Streptococci mutans |
C. | Streptococci pneumonia |
D. | Streptococci Bovis |
Answer» C. Streptococci pneumonia | |
11. |
Which is false regarding gram-positive cocci? |
A. | Staph. saprophytic causes UTI females |
B. | Micrococci are oxidase positive |
C. | Most enterococci are sensitive to penicillin |
D. | Pneumococci are capsulated |
Answer» D. Pneumococci are capsulated | |
12. |
A patient of RHD developed infective endocarditis after dental extraction. The most likely organism causing this is: |
A. | Streptococcus viridans |
B. | Streptococcus pneumonia |
C. | Streptococcus pyogenes |
D. | S. aureus |
Answer» B. Streptococcus pneumonia | |
13. |
Most common cause of artificial heart valve infection: in the first 3 months |
A. | Staphylococcus aureus |
B. | Streptococcus mutans |
C. | Staph epidermidis |
D. | Pneumococcus |
Answer» D. Pneumococcus | |
14. |
Which of the following immunity is protective against infection by S.pyogenes? |
A. | cell-mediated immunity |
B. | antigen-antibody immunity |
C. | humoral immunity |
D. | no cure present |
Answer» D. no cure present | |
15. |
Scarlet fever is similar to the pharyngitis in all respects. |
A. | True |
B. | False |
Answer» C. | |
16. |
Which of the following microbe does not belong to Group D enterococci group? |
A. | S. faecalis |
B. | S. faecium |
C. | S. durans |
D. | S. bovis |
Answer» E. | |
17. |
Streptococus pyogenes comprises which Lancefield group? |
A. | A |
B. | B |
C. | C |
D. | D |
Answer» B. B | |
18. |
Antibiotics can easily reach the staphylococci. |
A. | True |
B. | False |
Answer» C. | |
19. |
Which of the following microorganism causes lesions in the form of abscesses? |
A. | Staphylococcus aureus |
B. | Streptococcus pyogenes |
C. | Streptococcus pneumoniae |
D. | Clostridium perfringens |
Answer» B. Streptococcus pyogenes | |
20. |
Blood culture is positive in which infection of staph.aureus: |
A. | TSS |
B. | SSSS |
C. | Infective endocarditis |
D. | Impetigo |
Answer» D. Impetigo | |
21. |
Staphylococcal scalded skin syndrome is caused by: |
A. | Hemolysin |
B. | Coagulase |
C. | Enterotoxin |
D. | Epidermolysis toxin |
Answer» E. | |
22. |
A cook is habitual of nose-picking while cooking. His clients are at risk for food poisoning with: |
A. | Clostridia difficle |
B. | Staph aureus |
C. | Vibrio cholerae |
D. | Bacillus cereus |
Answer» C. Vibrio cholerae | |
23. |
Catalase positive coagulase-negative -hemolytic bacteria: |
A. | Strep pyrogens |
B. | Staph aureus |
C. | Coagulase-negative staph |
D. | Enterococci |
Answer» D. Enterococci | |
24. |
Catalase positive, beta-hemolytic-staphylococcus: |
A. | S aureus |
B. | S epidermidis |
C. | S saprophytic |
D. | None |
Answer» B. S epidermidis | |
25. |
Gas gangrene is most likely associated with infection with: |
A. | Staphylococcus aureus |
B. | Clostridium perfringenes |
C. | Streptococcus pneumoniae |
D. | Neisseria gonorrhoeae |
Answer» C. Streptococcus pneumoniae | |
26. |
The leading cause of preventable blindness in the world is caused by: |
A. | Chlamydia trachomatis |
B. | B. |
C. | C. |
D. | D. |
Answer» B. B. | |
27. |
Bacterial conjunctivitis (inflammation of the eye conjunctiva) can be caused by: |
A. | Staphylococcus aureus |
B. | Streptococcus pneumoniae |
C. | Pseudomonas aeruginosa |
D. | All of the above bacteria can cause conjunctivitis |
Answer» E. | |
28. |
The bacteria that multiply in blocked skin pores, metabolize sebum, and can lead to the development of acne are: |
A. | Pseudomonas aeruginosa |
B. | Propionibacterium spp. |
C. | Serratia marcescens |
D. | Streptococcus pyogenes |
Answer» C. Serratia marcescens | |
29. |
Burn patients often develop nosocomial infection caused by: |
A. | Staphylococcus epidermis |
B. | Staphylococcus aureus |
C. | Pseudomonas aeruginosa |
D. | Candida albicans |
Answer» D. Candida albicans | |
30. |
Test to differentiate staphylococci from micrococci: |
A. | Catalase test |
B. | Coagulase test |
C. | Novobiocin sensitivity |
D. | Oxidation fermentation |
Answer» E. | |
31. |
Most common site for staphylococcus carrier: |
A. | Skin |
B. | Nose |
C. | Oropharynx |
D. | Perineum |
Answer» C. Oropharynx | |
32. |
Best available option to prevent MRSA infection in a hospital: |
A. | Prophylactic antibiotics |
B. | Fumigation of wards |
C. | Proper handwashing |
D. | Use of disinfectants |
Answer» D. Use of disinfectants | |
33. |
Staphylococcus aureus does not cause which of the following skin in infection: |
A. | Ecthyma gangrenous |
B. | Bullous impetigo |
C. | Botryomycosis |
D. | Cellulitis |
Answer» B. Bullous impetigo | |
34. |
Coagulase test differentiates: |
A. | Staphylococci from streptococci |
B. | Streptococci from enterococci |
C. | Staph aureus from staph epidermis |
D. | Staph epidermidis from staph saprophyticus |
Answer» D. Staph epidermidis from staph saprophyticus | |
35. |
Protein A of staphylococcus binds to: |
A. | IgA |
B. | IgG |
C. | IgD |
D. | IgE |
Answer» C. IgD | |
36. |
For phage typing, how many phages of staphylococcus aureus are used: |
A. | 12 |
B. | 15 |
C. | 20 |
D. | 28 |
Answer» E. | |
37. |
All cause Fournier gangrene except: |
A. | Staphylococcus |
B. | Streptococcus |
C. | Clostridium |
D. | Bacteroides |
Answer» D. Bacteroides | |
38. |
Food poisoning case with diarrhea within 6 hours: |
A. | Staph aureus |
B. | Cl.perfringens |
C. | Cl.botulinum |
D. | V.cholerae |
Answer» B. Cl.perfringens | |
39. |
Which of the following Staphylococcal haemolysins does not cause lysis of human RBCs? |
A. | haemolysin |
B. | haemolysin |
C. | haemolysin |
D. | haemolysin |
Answer» D. haemolysin | |
40. |
Staphylococcal food poisoning usually manifests itself following ingestion of contaminated food after |
A. | 2-6 hours |
B. | 8-12 hours |
C. | 12-18 hours |
D. | 18-36 hours |
Answer» B. 8-12 hours | |
41. |
The pus producing skin infections (pyoderma) can be caused by |
A. | Staphylococci |
B. | Streptococci |
C. | Corynebacteria |
D. | All of these |
Answer» E. | |
42. |
Which of the following is not the characteristics of impetigo? |
A. | Common in children |
B. | Can be caused by Staphylococcus aureus |
C. | Can be caused by Streptococcus pyogenes |
D. | Can be caused by pseudomonads |
Answer» E. | |
43. |
Scalded skin syndrome is caused by exotoxin (exfoliatins) produced by: |
A. | |
B. | B. |
C. | C. |
D. | D. |
Answer» D. D. | |
44. |
Which of the following microorganisms causes scarlet fever? |
A. | Streptococcus pyogens |
B. | Pseudomonas aeruginosa |
C. | Staphylococcus aureus |
D. | Propionibacterium acne |
Answer» B. Pseudomonas aeruginosa | |
45. |
A massive lesion caused by the spread of Staphylococcus aureus infection (often on the neck and upper back) is called: |
A. | Boil |
B. | Abscess |
C. | Furuncle |
D. | Carbuncle |
Answer» D. Carbuncle | |
46. |
Most strains of Staphylococcus aureus indicate |
A. | phosphatase production |
B. | a golden-yellow pigment |
C. | -haemolysis on sheep blood agar |
D. | all of the above |
Answer» E. | |
47. |
The most common cause of cystitis (after Escherichia coli) in healthy sexually active women is |
A. | Staphylococcus saprophyticus |
B. | Proteus mirabilis |
C. | Pseudomonas aeruginosa |
D. | Klebsiella pneumoniae |
Answer» B. Proteus mirabilis | |
48. |
Which of the following Staphylococcal haemolysins does not possess leucocidal activity? |
A. | haemolysin |
B. | haemolysin |
C. | haemolysin |
D. | haemolysin |
Answer» D. haemolysin | |
49. |
The toxin of Staphylococcus aureus that may result into scalded skin syndrome is |
A. | Enterotoxin |
B. | Leucocidin |
C. | Epidermolytic toxin |
D. | Haemolysin |
Answer» D. Haemolysin | |
50. |
Most common nosocomial infection is: |
A. | Staph aureus |
B. | E.coli |
C. | Legionella |
D. | Strep pneumonia |
Answer» B. E.coli | |