Question 1

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

Accepted Answer

streptolys...

Question 2

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.F) A) and E)
G) A) and D)

Question 3

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

Accepted Answer

A) True 
 B)False

Question 4

Neisseria meningitidis and Neisseria gonorrhoeae are fastidious, gram-negative cocci that produce oxidase.

Accepted Answer

A) True 
 B)False

Question 5

Symptoms of Toxic Shock Syndrome include all the following, except

Accepted Answer

A)   fever and muscle pain.
B)   appearance of flesh being "eaten" down to the muscle.
C)   nausea, vomiting and diarrhea.
D)   sunburn-like rash.
E)   kidney and liver failure.F) B) and C)
G) A) and C)

Question 6

Having received no prenatal care, a young woman arrives at a hospital after many hours of labor and delivers a baby girl. Three days later the baby girl is listless, nursing poorly, and is running a fever. Blood cultures are done, and after 24 hours, they are Gram stained and show the presence of gram-positive cocci in pairs and short chains. Upon subculture, these form colonies that are beta hemolytic on blood agar. Further tests demonstrate that the isolate is catalase negative, resistant to bacitracin, and is CAMP test positive. What is the identification of this organism?

Accepted Answer

A)   Streptococcus pyogenes
B)   Streptococcus pneumoniae
C)   Streptococcus agalactiae
D)   Staphylococcus aureus
E)   Neisseria meningitidisF) A) and C)
G) C) and D)

Question 7

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.F) A) and D)
G) A) and C)

Question 8

The viridans streptococci are

Accepted Answer

A)   not entirely groupable by Lancefield serology.
B)   the most numerous residents of the oral cavity.
C)   opportunists that can cause subacute endocarditis.
D)   introduced to deeper body tissues by dental or surgical procedures.
E)   All of these choices are correct.F) B) and C)
G) B) and E)

Question 9

In which of the following situations would Staphylococcus epidermidis be the most likely etiologic agent?

Accepted Answer

A)   otitis media
B)   food intoxication
C)   urinary bladder infection
D)   infected IV catheter site
E)   conjunctivitisF) All of the above
G) A) and B)

Question 10

The enzyme that coagulates pla is

Accepted Answer

A)   catalase.
B)   coagulase.
C)   hyaluronidase.
D)   staphylokinase.
E)   Dnase.F) All of the above
G) A) and B)

Question 11

An 8-month old infant has been brought to the ER with a high fever. Her parents indicate that she has not been eating or drinking well and has been very irritable until the last few hours during which she has been only minimally responsive. Suspecting meningitis, a spinal tap is done and the CSF sample is sent to the lab for analysis. The white blood cell count on the sample is profoundly elevated, the protein content is elevated, and the glucose level is depressed. The Gram stained smear shows gram-positive cocci in pairs. Cultures are done and after overnight incubation, alpha hemolytic colonies are observed on the blood plate. These colonies contain gram-positive cocci, which are catalase negative. An optochin susceptibility test is done and there is a large zone of inhibition around the disk. What is the identification of this isolate?

Accepted Answer

A)   Streptococcus pneumoniae
B)   viridans Streptococci
C)   Enterococcus faecalis
D)   Neisseria meningitidis
E)   Streptococcus agalactiaeF) A) and C)
G) B) and C)

Question 12

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.F) A) and C)
G) C) and D)

Question 13

List three enzymes and four toxins produced by Staphylococcus aureus. For each enzyme and toxin, discuss its effect on patient tissues and how it contributes to virulence of this pathogen.

Accepted Answer

Three enzymes produced by Staphylococcus...

Question 14

Local Staphylococcus aureus infections often involve formation of an abscess.

Accepted Answer

A) True 
 B)False

Question 15

All the following pertain to Staphylococcus epidermidis infections, except

Accepted Answer

A)   they often develop 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.F) A) and C)
G) B) and D)

Question 16

Which organism is associated with commonly causing urinary tract infections in sexually active young adult and adolescent females?

Accepted Answer

A)   Staphylococcus aureus
B)   Staphylococcus epidermidis
C)   Staphylococcus saprophyticus
D)   Streptococcus pyogenes
E)   Streptococcus agalactiaeF) B) and E)
G) A) and D)

Question 17

An individual with asymptomatic N. gonorrhoeae may not spread the disease.

Accepted Answer

A) True 
 B)False

Question 18

Streptococcus pyogenes causes all the following, except

Accepted Answer

A)   necrotizing fasciitis.
B)   erysipelas.
C)   impetigo.
D)   scarlet fever.
E)   scalded skin syndrome.F) B) and C)
G) A) and E)

Question 19

All of the following are correct about Staphylococcus aureus, except

Accepted Answer

A)   it is the coagulase-positive species.
B)   the body's most powerful defense against it lies in the T-cell response.
C)   carriers may be treated with antibiotics to clear them of the bacteria.
D)   most strains are resistant to penicillin and ampicillin.
E)   it causes furuncles, carbuncles, and abscesses.F) A) and B)
G) D) and E)

Question 20

Sue brought her daughter Amy to the pediatrician complaining of a sore throat. The physician examines Amy and observes that her throat is bright red and there are white pus-filled nodules on her tonsils. Which of the following conclusions should be made?

Accepted Answer

A)   She has a strep throat and should begin antibiotics.
B)   She should have a rapid strep test performed before a diagnosis is made.
C)   She should go home and rest because most sore throats are viral in origin.
D)   She should go home and come back in two days for a strep test since it may take that long to show up.
E)   She has a staphylococcal sore throat and should begin antibiotics immediately.F) A) and B)
G) A) and C)

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

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

Correct Answer
verified

Streptococcal pharyngitis involves all the following, except

Correct Answer
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An individual with asymptomatic N. gonorrhoeae may not spread the disease.

Correct Answer
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All of the following are correct about Streptococcus pyogenes, except

Correct Answer
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Correct Answer
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In which of the following situations would Staphylococcus epidermidis be the most likely etiologic agent?

Correct Answer
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Streptococcus pyogenes causes all the following, except

Correct Answer
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Which organism is associated with commonly causing urinary tract infections in sexually active young adult and adolescent females?

Correct Answer
verified

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

Correct Answer
verified

Symptoms of Toxic Shock Syndrome include all the following, except

Correct Answer
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All the following pertain to Staphylococcus epidermidis infections, except

Correct Answer
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Local Staphylococcus aureus infections often involve formation of an abscess.

Correct Answer
verified

The enzyme that coagulates pla is

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

Correct Answer
verified
streptolys...
View Answer

Sue brought her daughter Amy to the pediatrician complaining of a sore throat. The physician examines Amy and observes that her throat is bright red and there are white pus-filled nodules on her tonsils. Which of the following conclusions should be made?

Correct Answer
verified

Correct Answer
verified

List three enzymes and four toxins produced by Staphylococcus aureus. For each enzyme and toxin, discuss its effect on patient tissues and how it contributes to virulence of this pathogen.

Correct Answer
Answered by ExamLex AI
Three enzymes produced by Staphylococcus...
View Answer

Neisseria meningitidis and Neisseria gonorrhoeae are fastidious, gram-negative cocci that produce oxidase.

Correct Answer
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The viridans streptococci are

Correct Answer
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All of the following are correct about Staphylococcus aureus, except

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

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

Correct AnswerverifiedShow Answer

Streptococcal pharyngitis involves all the following, except

Correct AnswerverifiedShow Answer

An individual with asymptomatic N. gonorrhoeae may not spread the disease.

Correct AnswerverifiedShow Answer

All of the following are correct about Streptococcus pyogenes, except

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

In which of the following situations would Staphylococcus epidermidis be the most likely etiologic agent?

Correct AnswerverifiedShow Answer

Streptococcus pyogenes causes all the following, except

Correct AnswerverifiedShow Answer

Which organism is associated with commonly causing urinary tract infections in sexually active young adult and adolescent females?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Symptoms of Toxic Shock Syndrome include all the following, except

Correct AnswerverifiedShow Answer

All the following pertain to Staphylococcus epidermidis infections, except

Correct AnswerverifiedShow Answer

Local Staphylococcus aureus infections often involve formation of an abscess.

Correct AnswerverifiedShow Answer

The enzyme that coagulates pla is

Correct AnswerverifiedShow Answer

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

Correct Answerverifiedstreptolys...View AnswerShow Answer

Sue brought her daughter Amy to the pediatrician complaining of a sore throat. The physician examines Amy and observes that her throat is bright red and there are white pus-filled nodules on her tonsils. Which of the following conclusions should be made?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

List three enzymes and four toxins produced by Staphylococcus aureus. For each enzyme and toxin, discuss its effect on patient tissues and how it contributes to virulence of this pathogen.

Correct AnswerAnswered by ExamLex AIThree enzymes produced by Staphylococcus...View AnswerShow Answer

Neisseria meningitidis and Neisseria gonorrhoeae are fastidious, gram-negative cocci that produce oxidase.

Correct AnswerverifiedShow Answer

The viridans streptococci are

Correct AnswerverifiedShow Answer

All of the following are correct about Staphylococcus aureus, except

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

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

Correct Answer
verified
streptolys...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
Three enzymes produced by Staphylococcus...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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