Question 1

Streptococcal pharyngitis involves all the following, except:

Accepted Answer

A)  a purulent exudate over the tonsils.
B)  can lead to scarlet fever if it is an erythrogenic toxin-producing strain.
C)  can lead to serious sequelae.
D)  is usually caused by the viridans streptococci.
E)  causes redness, difficulty in swallowing, and fever.

Question 2

The enzyme that coagulates plasma is:

Accepted Answer

A)  catalase.
B)  coagulase.
C)  hyaluronidase.
D)  staphylokinase.
E)  Dnase.

Question 3

The M protein of Streptococcus pyogenes:

Accepted Answer

A)  is the basis for the organism belonging to Lancefield group A.
B)  gives rise to a zone of b hemolysis on blood agar.
C)  protects against phagocytosis and enhances adherence.
D)  is also called streptokinase.
E)  protects against lysozyme damage.

Question 4

Explain what is meant by MRSA, why it is a particular concern to hospitals, and what action hospitals are taking to prevent MRSA spread.

Accepted Answer

MRSA stands for Methicillin-resistant St...

Question 5

Which chemical produced by S.aureus is also known as "spreading factor"?

Accepted Answer

A)  Coagulase
B)  Penicillinase
C)  Hemolysin
D)  Hyaluronidase
E)  Toxic shock syndrome toxin

Question 6

All the following pertain to Staphylococcus epidermidis infections, except:

Accepted Answer

A)  they often from an endogenous source.
B)  they typically occur after insertion of shunts and prosthetic devices.
C)  catheterization can introduce the organism and lead to urinary tract infection.
D)  the organism is coagulase negative.
E)  the organism produces a large number of tissue damaging enzymes and toxins.

Question 7

The most common site where carriers of Staphylococcus aureus carry this pathogen is:

Accepted Answer

A)  all over the skin.
B)  under the fingernails.
C)  anterior nares (nostrils) .
D)  mouth.
E)  intestines.

Question 8

Pneumovax is a vaccine for prevention of disease caused by strains of Neisseria meningitidis.

Accepted Answer

A) True 
 B)False

Question 9

Discuss how normal flora Staphylococcus epidermidis can cause disease in the body, and describe the diseases that it causes.

Accepted Answer

Staphylococcus epidermidis is a type of ...

Question 10

Which pathogen has drug resistant strains called MRSA?

Accepted Answer

A)  Staphylococcus aureus
B)  Staphylococcus epidermidis
C)  Staphylococcus saprophyticus
D)  Streptococcus pyogenes
E)  Streptococcus agalactiae

Question 11

Rebecca Lancefield differentiated streptococci on the basis of differences in their:

Accepted Answer

A)  cell wall carbohydrates in a serological test.
B)  patterns of hemolysis on blood agar.
C)  ability to produce catalase.
D)  gram stain appearance.
E)  All of the choices are correct.

Question 12

Which pathogen is the most common cause of neonatal pneumonia, sepsis, and meningitis in the United States?

Accepted Answer

A)  Staphylococcus aureus
B)  Staphylococcus epidermidis
C)  Staphylococcus saprophyticus
D)  Streptococcus pyogenes
E)  Streptococcus agalactiae

Question 13

The two important hemolysins of Group A streptococci are _____ and _____.

Accepted Answer

streptolys...

Question 14

Scarlet fever is caused by strains of:

Accepted Answer

A)  Staphylococcus aureus.
B)  Staphylococcus epidermidis.
C)  Staphylococcus saprophyticus.
D)  Streptococcus pyogenes.
E)  Streptococcus agalactiae.

Question 15

The majority of otitis media in children is mainly due to infection with:

Accepted Answer

A)  Streptococcus pneumoniae.
B)  Streptococcus pyogenes.
C)  Branhamella (Moraxella)  catarrhalis.
D)  Streptococcus agalactiae.
E)  Staphylococcus saprophyticus.

Question 16

Staphylococci can be differentiated from streptococci by the:

Accepted Answer

A)  Gram stain.
B)  coagulase test.
C)  catalase test.
D)  fermentation of mannitol.
E)  None of the choices are correct.

Question 17

All of the following are correct about Streptococcus pyogenes, except:

Accepted Answer

A)  humans are the only significant reservoir.
B)  some of the streptococcal toxins act as superantigens.
C)  most strains do not have a capsule.
D)  it can cause impetigo and erysipelas.
E)  infection is generally through direct contact.

Question 18

Necrotizing fasciitis is:

Accepted Answer

A)  also called impetigo.
B)  possibly caused by antibodies to Group A streptococci that cross-react with body tissues.
C)  associated with strains of Streptococcus pyogenes producing destructive enzymes and toxins.
D)  typically a sequelae of streptococcal pharyngitis.
E)  not treatable with antimicrobic drugs.

Question 19

It is theorized that rheumatic fever and acute glomerulonephritis could be the result of antibodies to Group A streptococci that cross-react with patient tissues.

Accepted Answer

A) True 
 B)False

Question 20

The viridans group of streptococci and the pneumococcus produce _____ hemolysis on blood agar.

Accepted Answer

The answer of The viridans group of streptococci and the...

Exam 18: The Gram-Positive and Gram-Negative Cocci of Medical Importance

Which pathogen is the most common cause of neonatal pneumonia, sepsis, and meningitis in the United States?

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Rebecca Lancefield differentiated streptococci on the basis of differences in their:

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Staphylococci can be differentiated from streptococci by the:

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Necrotizing fasciitis is:

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The most common site where carriers of Staphylococcus aureus carry this pathogen is:

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Pneumovax is a vaccine for prevention of disease caused by strains of Neisseria meningitidis.

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Scarlet fever is caused by strains of:

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The viridans group of streptococci and the pneumococcus produce _____ hemolysis on blood agar.

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The majority of otitis media in children is mainly due to infection with:

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The two important hemolysins of Group A streptococci are _____ and _____.

Correct Answerverifiedstreptolys...View AnswerShow Answer

All the following pertain to Staphylococcus epidermidis infections, except:

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Explain what is meant by MRSA, why it is a particular concern to hospitals, and what action hospitals are taking to prevent MRSA spread.

Correct AnswerAnswered by ExamLex AIMRSA stands for Methicillin-resistant St...View AnswerShow Answer

All of the following are correct about Streptococcus pyogenes, except:

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The enzyme that coagulates plasma is:

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The M protein of Streptococcus pyogenes:

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Which chemical produced by S.aureus is also known as "spreading factor"?

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Streptococcal pharyngitis involves all the following, except:

Correct AnswerverifiedShow Answer

Discuss how normal flora Staphylococcus epidermidis can cause disease in the body, and describe the diseases that it causes.

Correct AnswerAnswered by ExamLex AIStaphylococcus epidermidis is a type of ...View AnswerShow Answer

It is theorized that rheumatic fever and acute glomerulonephritis could be the result of antibodies to Group A streptococci that cross-react with patient tissues.

Correct AnswerverifiedShow Answer

Which pathogen has drug resistant strains called MRSA?

Correct AnswerverifiedShow Answer

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The two important hemolysins of Group A streptococci are _ and _.

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streptolys...
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MRSA stands for Methicillin-resistant St...
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Staphylococcus epidermidis is a type of ...
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