Question 1

What are two tests presumptively used to identify group B strep?

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 A

Question 2

What causes the red spreading rash in scarlet fever?

Accepted Answer

A) Hyaluronidase 
B) Streptolysin O 
C) Streptococcal pyrogenic exotoxins 
D) Streptolysin S 
A) Hyaluronidase 
B) Streptolysin O 
C) Streptococcal pyrogenic exotoxins 
D) Streptolysin S C

Question 3

What two tests have been mainstays in identification schemes for the non-b-hemolytic, catalase-negative, gram-positive cocci?

Accepted Answer

A) Bacitracin and PYR 
B) Hippurate hydrolysis and optochin 
C) Nitrate and PYR 
D) Bile esculin and salt tolerance 
A) Bacitracin and PYR 
B) Hippurate hydrolysis and optochin 
C) Nitrate and PYR 
D) Bile esculin and salt tolerance D

Question 4

What is the cellular structure that Streptococcus pyogenes relies on for its virulence?

Accepted Answer

A) Peptidoglycan 
B) Lipopolysaccharide 
C) S antigens 
D) M proteins 
A) Peptidoglycan 
B) Lipopolysaccharide 
C) S antigens 
D) M proteins

Question 5

What disease is produced by group A streptococci that is characterized by a rapidly progressing inflammation and necrosis of the skin, subcutaneous fat, and fascia?

Accepted Answer

A) Erysipelas 
B) Scarlet fever 
C) Necrotizing fasciitis 
D) Streptococcal toxic shock syndrome 
A) Erysipelas 
B) Scarlet fever 
C) Necrotizing fasciitis 
D) Streptococcal toxic shock syndrome

Question 6

Why do Streptococcus pneumoniae colonies on sheep blood agar (SBA) appear like a coin-raised edges and a depressed center?

Accepted Answer

A) The older growth at the center is smaller due to lack of nutrients. 
B) The newer growths on the outside of the colony undergo the quellung reaction. 
C) The older growth at the center is killed due to autolysis. 
D) The newer growth has a thicker capsule, therefore it appears raised. 
A) The older growth at the center is smaller due to lack of nutrients. 
B) The newer growths on the outside of the colony undergo the quellung reaction. 
C) The older growth at the center is killed due to autolysis. 
D) The newer growth has a thicker capsule, therefore it appears raised.

Question 7

Most doctors' offices use the rapid throat swab methods to identify Streptococcus pyogenes.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 8

Streptococcus pneumoniae causes all the following infections except:

Accepted Answer

A) pharyngitis. 
B) pneumonia. 
C) bacteremia. 
D) meningitis. 
A) pharyngitis. 
B) pneumonia. 
C) bacteremia. 
D) meningitis.

Question 9

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 10

What test is used as a 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

Question 11

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

Accepted Answer

A) pyogenic streptococci. 
B) lactococci. 
C) b-hemolytic streptococci. 
D) enterococci. 
A) pyogenic streptococci. 
B) lactococci. 
C) b-hemolytic streptococci. 
D) enterococci.

Question 12

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 13

What test presumptively differentiates b-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 14

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 15

Which of the following is the drug of choice for treating most streptococcal infections?

Accepted Answer

A) Erythromycin 
B) Cephalothin 
C) Penicillin 
D) Gentamicin 
A) Erythromycin 
B) Cephalothin 
C) Penicillin 
D) Gentamicin

Question 16

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 17

Skin or pyoderma infections with group A streptococci result in all the following syndromes except:

Accepted Answer

A) impetigo. 
B) bullous impetigo. 
C) cellulitis. 
D) erysipelas. 
A) impetigo. 
B) bullous impetigo. 
C) cellulitis. 
D) erysipelas.

Question 18

What organism on sheep blood agar (SBA) has grayish white colonies surrounded by a small zone of b-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

Question 19

What is the hemolysin responsible for hemolysis on SBA 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 20

Two serious complications of an infection with group A streptococcal disease are:

Accepted Answer

A) toxic shock syndrome and scarlet fever. 
B) gangrene and rheumatic fever. 
C) acute glomerulonephritis and necrotizing fasciitis. 
D) acute glomerulonephritis and rheumatic fever. 
A) toxic shock syndrome and scarlet fever. 
B) gangrene and rheumatic fever. 
C) acute glomerulonephritis and necrotizing fasciitis. 
D) acute glomerulonephritis and rheumatic fever.

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

What are two tests presumptively used to identify group B strep?

What causes the red spreading rash in scarlet fever?

What two tests have been mainstays in identification schemes for the non-b-hemolytic, catalase-negative, gram-positive cocci?

What is the cellular structure that Streptococcus pyogenes relies on for its virulence?

What disease is produced by group A streptococci that is characterized by a rapidly progressing inflammation and necrosis of the skin, subcutaneous fat, and fascia?

Why do Streptococcus pneumoniae colonies on sheep blood agar (SBA) appear like a coin-raised edges and a depressed center?

Most doctors' offices use the rapid throat swab methods to identify Streptococcus pyogenes.If the test is positive, the physician treats the patient.What should happen if the test is negative?

Streptococcus pneumoniae causes all the following infections except:

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

What test is used as a presumptive identification of Streptococcus pneumoniae?

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

The atmospheric conditions best suited to grow streptococci and enterococci are:

What test presumptively differentiates b-hemolytic group A streptococci and nonhemolytic group D enterococci from other streptococcal species?

What is VRE?

Which of the following is the drug of choice for treating most streptococcal infections?

What two tests are presumptively used to identify Enterococcus?

Skin or pyoderma infections with group A streptococci result in all the following syndromes except:

What organism on sheep blood agar (SBA) has grayish white colonies surrounded by a small zone of b-hemolysis?

What is the hemolysin responsible for hemolysis on SBA incubated anaerobically?

Two serious complications of an infection with group A streptococcal disease are:

Bacterial Cell Structure, Physiology, Metabolism, and Genetics

Host-Parasite 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

Antimicrobial Susceptibility Testing

Staphylococci

Aerobic Gram-Positive Bacilli

Neisseria Species and Moraxella Catarrhalis

Haemophilus and Other Fastidious Gram-Negative Bacilli

Enterobacteriaceae

Vibrio, Aeromonas, Plesiomonas, 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 Diseases

Infections in Special Populations

Zoonotic Diseases

Ocular Infections

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