Question 1

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

Question 2

What is the drug of choice to treat group A streptococci when the patient cannot tolerate penicillin?

Accepted Answer

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

Question 3

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 4

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 5

What organism on sheep blood agar (SBA)has colonies that are small and transparent,surrounded by a wide zone of b-hemolysis?

Accepted Answer

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

Question 6

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 7

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 8

What is the drug of choice to treat Streptococcus pneumoniae?

Accepted Answer

A)  Erythromycin 
B)  Penicillin 
C)  Zithromax 
D)  Chloramphenicol 
A)  Erythromycin 
B)  Penicillin 
C)  Zithromax 
D)  Chloramphenicol

Question 9

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 10

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 11

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

Question 12

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 13

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

Question 14

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 15

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 16

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 17

What test can be used to differentiate S.agalactiae from other b-hemolytic streptococci?

Accepted Answer

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

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

What causes the red spreading rash in scarlet fever?

What is the drug of choice to treat group A streptococci when the patient cannot tolerate penicillin?

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

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?

What organism on sheep blood agar (SBA)has colonies that are small and transparent,surrounded by a wide zone of b-hemolysis?

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

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

What is the drug of choice to treat Streptococcus pneumoniae?

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

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

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

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?

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

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

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

Streptococcus agalactiae is a significant cause of?

What test can be used to differentiate S.agalactiae from other b-hemolytic streptococci?

Bacterial Cell Structure, physiology, Metabolism, and Genetics

Host-Parasite Interaction

Laboratory Role in Infection Control

Control of Microorganisms

Performance Improvement in the Microbiology Laboratory

Specimen Collection and Processing

Microscopic Examination of Infected Materials

Use of Colonial Morphology for the Presumptive Identification of Microorganisms

Biochemical Identification of Gram-Negative Bacteria

Immunodiagnosis of Infectious Diseases

Applications of Molecular Diagnostics

Antibiotic 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

Spirochetes

Chlamydia and Rickettsia

Mycoplasma and Ureaplasma

Mycobacterium Tuberculosis and Other Nontuberculosis Mycobacteria

Medically Significant Fungi

Diagnostic Parasitology

Clinical Virology

Agents of Bioterror

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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