Explore topic-wise MCQs in Staplylococcus.

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