Question 1

What is VRE?

Accepted Answer

A)   Vancomycin-ready erythromycin
B)   Very-reliable erythromycin
C)   Vancomycin-resistant Enterococcus
D)   Veocin-resistant EnterococcusE) A) and B)
F) All of the above

Question 2

Physiologic classification of streptococci divide the species into all the following groups, except

Accepted Answer

A)   pyogenic streptococci.
B)   lactococci.
C)    β\betaβ -hemolytic streptococci.
D)   Enterococci. E) A) and B)
F) None of the above

Question 3

A microbiologist is reading a vaginal culture on the bench. There is growth on the SBA and chocolate (CHOC)  plates, but no growth on the MacConkey (MAC)  plate. The colonies growing on the SBA have produced a narrow, diffuse zone of  β\betaβ -hemolysis around and under the colonies. What organism could this be?

Accepted Answer

A)   Escherichia coli
B)   Streptococcus agalactiae
C)   Streptococcus pyogenes
D)   Streptococcus pneumoniae E) A) and B)
F) A) and C)

Question 4

What organism on SBA has grayish white colonies surrounded by a small zone of  β\betaβ -hemolysis?

Accepted Answer

A)   Viridans strep
B)   Enterococcus
C)   Streptococcus pyogenes
D)   Streptococcus agalactiae E) A) and B)
F) A) and C) D

Question 5

What are two tests presumptively used to identify Group B streptococci?

Accepted Answer

A)   Hippurate hydrolysis and CAMP
B)   Optochin and PYR
C)   Bacitracin and PYR
D)   PYR and hippurate hydrolysisE) A) and C)
F) A) and D)

Question 6

Common schemes to classify streptococci include all the following, except

Accepted Answer

A)   biochemical characteristics.
B)   serologic grouping or typing of C carbohydrate.
C)   physiologic characteristics.
D)   flagellar antigens.E) B) and C)
F) A) and D) D

Question 7

What is the hemolysin responsible for hemolysis on SBA by Group A streptococci incubated anaerobically?

Accepted Answer

A)   Hyaluronidase
B)   Streptolysin O
C)   Streptolysin D
D)   Hemolysin OE) B) and D)
F) B) and C)

Question 8

Streptococcus-like organisms that resemble enterococci and viridans streptococci include all the following, except

Accepted Answer

A)   Moraxella.
B)   Aerococcus.
C)   Gemella.
D)   Lactococcus.E) A) and C)
F) A) and B)

Question 9

Most physicians' offices use a rapid throat swab method to identify Streptococcus pyogenes infections in children. If the test is positive, the physician treats the patient. What should happen if the test is negative?

Accepted Answer

A)   The physician should treat the patient to be safe.
B)   The physician should perform a throat culture.
C)   The physician should repeat the rapid strep tests.
D)   None of the aboveE) A) and D)
F) A) and C)

Question 10

Which two tests are often used in the identification of the non- β\betaβ -hemolytic, catalase-negative, gram-positive cocci?

Accepted Answer

A)   Bacitracin and CAMP
B)   Hippurate hydrolysis and optochin
C)   Nitrate and CAMP
D)   Bile esculin and salt tolerance E) None of the above
F) C) and D)

Question 11

What organism forms small, transparent colonies surrounded by a wide zone of  β\betaβ -hemolysis on SBA?

Accepted Answer

A)   Streptococcus agalactiae
B)   Streptococcus pyogenes
C)   Enterococcus
D)   Viridans strep E) B) and D)
F) B) and C)

Question 12

What two tests are presumptively used to identify Enterococcus?

Accepted Answer

A)   PYR and hippurate hydrolysis
B)   Bile esculin and 6.5% NaCl broth
C)   Bacitracin and PYR
D)   Catalase and coagulaseE) B) and D)
F) A) and B)

Question 13

What test is used for the presumptive identification of Streptococcus pneumoniae?

Accepted Answer

A)   Optochin
B)   Bacitracin
C)   PYR
D)   Hippurate hydrolysisE) A) and C)
F) B) and C) A

Question 14

What test presumptively differentiates  β\betaβ -hemolytic Group A streptococci and nonhemolytic Group D enterococci from other streptococcal species?

Accepted Answer

A)   Bacitracin
B)   Hippurate hydrolysis
C)   PYR
D)   Optochin E) A) and B)
F) B) and D)

Question 15

Streptococcus agalactiae is a significant cause of

Accepted Answer

A)   pharyngitis.
B)   cystitis.
C)   invasive disease of the newborn.
D)   vaginitis.E) A) and D)
F) A) and C)

Question 16

A patient comes to the emergency department with a productive cough, shortness of breath, and a fever of 102° F. The patient is diagnosed with pneumonia. What organism commonly encountered in the microbiology laboratory can cause this disease?

Accepted Answer

A)   Streptococcus pneumoniae
B)   Staphylococcus aureus
C)   Escherichia coli
D)   Haemophilus influenzaeE) A) and B)
F) None of the above

Question 17

Which of the following tests can be used to identify Group B streptococci?

Accepted Answer

A)   CAMP
B)   Lancefield
C)   Bacitracin
D)   OptochinE) A) and D)
F) A) and C)

Question 18

What test differentiates staphylococci from streptococci?

Accepted Answer

A)   Catalase
B)   Coagulase
C)    β\betaβ -Hemolysis
D)   All of the above E) All of the above
F) A) and B)

Question 19

A 57-year-old male presents to the emergency department with a fever, productive cough, and complaining of chest pain. A STAT Gram stain reveals gram-positive oval-shaped cocci in pairs. You should suspect

Accepted Answer

A)   Streptococcus pyogenes.
B)   Streptococcus. pneumoniae.
C)   Streptococcus agalactiae.
D)   Enterococcus faecalis.E) C) and D)
F) A) and B)

Question 20

The atmospheric conditions best suited to grow streptococci and enterococci are

Accepted Answer

A)   room air.
B)   oxygen-free atmosphere.
C)   high carbon dioxide concentration.
D)   low carbon dioxide concentration.E) B) and D)
F) A) and C)

Exam 15: Streptococcus, Enterococcus, and Other Catalase-Negative, Gram-Positive Cocci

What is VRE?

Correct Answer
verified

Physiologic classification of streptococci divide the species into all the following groups, except

Correct Answer
verified

Correct Answer
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What organism on SBA has grayish white colonies surrounded by a small zone of $\beta$ -hemolysis?

Correct Answer
verified
D

What are two tests presumptively used to identify Group B streptococci?

Correct Answer
verified

Common schemes to classify streptococci include all the following, except

Correct Answer
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D

What is the hemolysin responsible for hemolysis on SBA by Group A streptococci incubated anaerobically?

Correct Answer
verified

Streptococcus-like organisms that resemble enterococci and viridans streptococci include all the following, except

Correct Answer
verified

Most physicians' offices use a rapid throat swab method to identify Streptococcus pyogenes infections in children. If the test is positive, the physician treats the patient. What should happen if the test is negative?

Correct Answer
verified

Which two tests are often used in the identification of the non- $\beta$ -hemolytic, catalase-negative, gram-positive cocci?

Correct Answer
verified

What organism forms small, transparent colonies surrounded by a wide zone of $\beta$ -hemolysis on SBA?

Correct Answer
verified

What two tests are presumptively used to identify Enterococcus?

Correct Answer
verified

What test is used for the presumptive identification of Streptococcus pneumoniae?

Correct Answer
verified
A

What test presumptively differentiates $\beta$ -hemolytic Group A streptococci and nonhemolytic Group D enterococci from other streptococcal species?

Correct Answer
verified

Streptococcus agalactiae is a significant cause of

Correct Answer
verified

A patient comes to the emergency department with a productive cough, shortness of breath, and a fever of 102° F. The patient is diagnosed with pneumonia. What organism commonly encountered in the microbiology laboratory can cause this disease?

Correct Answer
verified

Which of the following tests can be used to identify Group B streptococci?

Correct Answer
verified

What test differentiates staphylococci from streptococci?

Correct Answer
verified

A 57-year-old male presents to the emergency department with a fever, productive cough, and complaining of chest pain. A STAT Gram stain reveals gram-positive oval-shaped cocci in pairs. You should suspect

Correct Answer
verified

The atmospheric conditions best suited to grow streptococci and enterococci are

Correct Answer
verified

Exam 15: Streptococcus, Enterococcus, and Other Catalase-Negative, Gram-Positive Cocci

What is VRE?

Correct AnswerverifiedShow Answer

Physiologic classification of streptococci divide the species into all the following groups, except

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What organism on SBA has grayish white colonies surrounded by a small zone of β\betaβ -hemolysis?

Correct AnswerverifiedD

What are two tests presumptively used to identify Group B streptococci?

Correct AnswerverifiedShow Answer

Common schemes to classify streptococci include all the following, except

Correct AnswerverifiedD

What is the hemolysin responsible for hemolysis on SBA by Group A streptococci incubated anaerobically?

Correct AnswerverifiedShow Answer

Streptococcus-like organisms that resemble enterococci and viridans streptococci include all the following, except

Correct AnswerverifiedShow Answer

Most physicians' offices use a rapid throat swab method to identify Streptococcus pyogenes infections in children. If the test is positive, the physician treats the patient. What should happen if the test is negative?

Correct AnswerverifiedShow Answer

Which two tests are often used in the identification of the non- β\betaβ -hemolytic, catalase-negative, gram-positive cocci?

Correct AnswerverifiedShow Answer

What organism forms small, transparent colonies surrounded by a wide zone of β\betaβ -hemolysis on SBA?

Correct AnswerverifiedShow Answer

What two tests are presumptively used to identify Enterococcus?

Correct AnswerverifiedShow Answer

What test is used for the presumptive identification of Streptococcus pneumoniae?

Correct AnswerverifiedA

What test presumptively differentiates β\betaβ -hemolytic Group A streptococci and nonhemolytic Group D enterococci from other streptococcal species?

Correct AnswerverifiedShow Answer

Streptococcus agalactiae is a significant cause of

Correct AnswerverifiedShow Answer

A patient comes to the emergency department with a productive cough, shortness of breath, and a fever of 102° F. The patient is diagnosed with pneumonia. What organism commonly encountered in the microbiology laboratory can cause this disease?

Correct AnswerverifiedShow Answer

Which of the following tests can be used to identify Group B streptococci?

Correct AnswerverifiedShow Answer

What test differentiates staphylococci from streptococci?

Correct AnswerverifiedShow Answer

A 57-year-old male presents to the emergency department with a fever, productive cough, and complaining of chest pain. A STAT Gram stain reveals gram-positive oval-shaped cocci in pairs. You should suspect

Correct AnswerverifiedShow Answer

The atmospheric conditions best suited to grow streptococci and enterococci are

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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What organism on SBA has grayish white colonies surrounded by a small zone of $\beta$ -hemolysis?

Correct Answer
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D

Correct Answer
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Correct Answer
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D

Correct Answer
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Correct Answer
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Correct Answer
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Which two tests are often used in the identification of the non- $\beta$ -hemolytic, catalase-negative, gram-positive cocci?

Correct Answer
verified

What organism forms small, transparent colonies surrounded by a wide zone of $\beta$ -hemolysis on SBA?

Correct Answer
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Correct Answer
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Correct Answer
verified
A

What test presumptively differentiates $\beta$ -hemolytic Group A streptococci and nonhemolytic Group D enterococci from other streptococcal species?

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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