Question 1

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

Accepted Answer

A)  Optochin 
B)  Bacitracin 
C)  PYR 
D)  Hippurate hydrolysis 
A)  Optochin 
B)  Bacitracin 
C)  PYR 
D)  Hippurate hydrolysis A

Question 2

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

Accepted Answer

A)  Viridans strep 
B)  Enterococcus 
C)  Streptococcus pyogenes 
D)  Streptococcus agalactiae 
A)  Viridans strep 
B)  Enterococcus 
C)  Streptococcus pyogenes 
D)  Streptococcus agalactiae D

Question 3

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

Question 4

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

Question 5

What is VRE?

Accepted Answer

A)  Vancomycin-ready erythromycin 
B)  Very-reliable erythromycin 
C)  Vancomycin-resistant Enterococcus 
D)  Veocin-resistant Enterococcus 
A)  Vancomycin-ready erythromycin 
B)  Very-reliable erythromycin 
C)  Vancomycin-resistant Enterococcus 
D)  Veocin-resistant Enterococcus

Question 6

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

Question 7

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

Question 8

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 above 
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 above

Question 9

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

Question 10

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 O 
A)  Hyaluronidase 
B)  Streptolysin O 
C)  Streptolysin D 
D)  Hemolysin O

Question 11

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

Accepted Answer

A)  pyogenic streptococci. 
B)  lactococci. 
C)  $\beta$-hemolytic streptococci. 
D)  Enterococci. 
A)  pyogenic streptococci. 
B)  lactococci. 
C)  $\beta$-hemolytic streptococci. 
D)  Enterococci.

Question 12

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

Accepted Answer

A)  CAMP 
B)  Lancefield 
C)  Bacitracin 
D)  Optochin 
A)  CAMP 
B)  Lancefield 
C)  Bacitracin 
D)  Optochin

Question 13

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 influenzae 
A)  Streptococcus pneumoniae 
B)  Staphylococcus aureus 
C)  Escherichia coli 
D)  Haemophilus influenzae

Question 14

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

Accepted Answer

A)  Bacitracin 
B)  Hippurate hydrolysis 
C)  PYR 
D)  Optochin 
A)  Bacitracin 
B)  Hippurate hydrolysis 
C)  PYR 
D)  Optochin

Question 15

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 $\beta$-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 
A)  Escherichia coli 
B)  Streptococcus agalactiae 
C)  Streptococcus pyogenes 
D)  Streptococcus pneumoniae

Question 16

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

Accepted Answer

A)  Moraxella. 
B)  Aerococcus. 
C)  Gemella. 
D)  Lactococcus. 
A)  Moraxella. 
B)  Aerococcus. 
C)  Gemella. 
D)  Lactococcus.

Question 17

Streptococcus agalactiae is a significant cause of

Accepted Answer

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

Question 18

Which two tests are often used in the identification of the non-$\beta$-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 
A)  Bacitracin and CAMP 
B)  Hippurate hydrolysis and optochin 
C)  Nitrate and CAMP 
D)  Bile esculin and salt tolerance

Question 19

What test differentiates staphylococci from streptococci?

Accepted Answer

A)  Catalase 
B)  Coagulase 
C)  $\beta$-Hemolysis 
D)  All of the above 
A)  Catalase 
B)  Coagulase 
C)  $\beta$-Hemolysis 
D)  All of the above

Question 20

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

Accepted Answer

A)  Streptococcus agalactiae 
B)  Streptococcus pyogenes 
C)  Enterococcus 
D)  Viridans strep 
A)  Streptococcus agalactiae 
B)  Streptococcus pyogenes 
C)  Enterococcus 
D)  Viridans strep

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

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

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

Common schemes to classify streptococci include all the following, except

What two tests are presumptively used to identify Enterococcus?

What is VRE?

The atmospheric conditions best suited to grow streptococci and enterococci are

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

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?

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

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

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

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

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?

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

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

Streptococcus agalactiae is a significant cause of

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

What test differentiates staphylococci from streptococci?

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

Bacterial Cell Structure, Physiology, Metabolism, and Genetics

Hostparasite Interaction

The Laboratory Role in Infection Control

Control of Microorganisms

Performance Improvement in the Microbiology Laboratory

Specimen Collection and Processing

Microscopic Examination of Materials From Infected Sites

Use of Colony Morphology for the Presumptive Identification of Microorganisms

Biochemical Identification of Gram-Negative Bacteria

Immunodiagnosis of Infectious Diseases

Applications of Molecular Diagnostics

Antimicrobial Agent Mechanisms of Action and Resistance Mechanisms

Antimicrobial Susceptibility Testing

Staphylococci

Aerobic Gram-Positive Bacilli

Neisseria Species and Moraxella Catarrhalis

Haemophilus, Hacek, Legionella, and Other Fastidious Gram-Negative Bacilli

Enterobacteriaceae

Vibrio, Aeromonas, and Campylobacter Species

Nonfermenting and Miscellaneous Gram-Negative Bacilli

Anaerobes of Clinical Importance

The Spirochetes

Chlamydia, Rickettsia, and Similar Organisms

Mycoplasma and Ureaplasma

Mycobacterium Tuberculosis and Nontuberculous Mycobacteria

Medically Significant Fungi

Diagnostic Parasitology

Clinical Virology

Agents of Bioterror and Forensic Microbiology

Biofilms: Architects of Disease

Upper and Lower Respiratory Tract Infections

Skin and Soft Tissue Infections

Gastrointestinal Infections and Food Poisoning

Infections of the Central Nervous System

Bacteremia and Sepsis

Urinary Tract Infections

Genital Infections and Sexually Transmitted Infections

Infections in Special Populations

Zoonotic Diseases

Ocular Infections

Filters

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

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

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

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