Question 1

Staphylococcal enterotoxin B is linked to:

Accepted Answer

A)  Carbuncles 
B)  Staphylococcal pseudomembranous enterocolitis 
C)  Food poisoning 
D)  Toxic shock syndrome 
A)  Carbuncles 
B)  Staphylococcal pseudomembranous enterocolitis 
C)  Food poisoning 
D)  Toxic shock syndrome

Question 2

The tests used to detect clumping factor will differentiate Staphylococcus aureus from other staphylococcal species.What are these tests?

Accepted Answer

A)  Novobiocin and hemolysin A 
B)  Coagulase and latex agglutination 
C)  Complement fixation and coagulase 
D)  Latex agglutination and enzyme immunoassay (EI
A)  
A)  Novobiocin and hemolysin A 
B)  Coagulase and latex agglutination 
C)  Complement fixation and coagulase 
D)  Latex agglutination and enzyme immunoassay (EI
A)

Question 3

Infections by this organism are predominantly hospital acquired,and some predisposing factors include catheterization,medical implantation,and immunosuppressive therapy.

Accepted Answer

A)  Staphylococcus aureus 
B)  S. intermedius 
C)  S. epidermidis 
D)  S. saprophyticus 
A)  Staphylococcus aureus 
B)  S. intermedius 
C)  S. epidermidis 
D)  S. saprophyticus

Question 4

This staphylococcus produces wide zones of beta hemolysis on 5% sheep blood agar.

Accepted Answer

A)  Staphylococcus epidermidis 
B)  S. aureus 
C)  S. intermedius 
D)  S. saprophyticus 
A)  Staphylococcus epidermidis 
B)  S. aureus 
C)  S. intermedius 
D)  S. saprophyticus

Question 5

What antibiotic is used for detection of methicillin resistance?

Accepted Answer

A)  Penicillin 
B)  Methicillin 
C)  Erythromycin 
D)  Oxacillin 
A)  Penicillin 
B)  Methicillin 
C)  Erythromycin 
D)  Oxacillin

Question 6

Colony characteristics for Staphylococcus aureus on blood agar after 18 to 24 hours incubation at 35° C include all the following EXCEPT:

Accepted Answer

A)  Swarming 
B)  Smooth 
C)  White 
D)  Round 
A)  Swarming 
B)  Smooth 
C)  White 
D)  Round

Question 7

This infection occurs secondary to influenza A virus,has a high mortality rate,and occurs among the infants and immunocompromised patients.

Accepted Answer

A)  Gangrene 
B)  Staphylococcal pneumoniae 
C)  Staphylococcal meningitis 
D)  Staphylococcal peritonitis 
A)  Gangrene 
B)  Staphylococcal pneumoniae 
C)  Staphylococcal meningitis 
D)  Staphylococcal peritonitis

Question 8

What are the effects of the Panton-Valentine toxin produced by Staphylococcus aureus?

Accepted Answer

A)  It acts on sphingomyelin in the plasma membrane of red blood cells. 
B)  It kills polymorphonuclear leukocytes. 
C)  It kills macrophages. 
D)  It lyses red blood cells, damages platelets and macrophages, and can cause severe tissue damage. 
A)  It acts on sphingomyelin in the plasma membrane of red blood cells. 
B)  It kills polymorphonuclear leukocytes. 
C)  It kills macrophages. 
D)  It lyses red blood cells, damages platelets and macrophages, and can cause severe tissue damage.

Question 9

Automated antimicrobial susceptibility testing methods are not reliable in detecting these resistant staphylococci.What antibiotic are the bacteria resistant to?

Accepted Answer

A)  Vancomycin 
B)  Erythromycin 
C)  Clindamycin 
D)  All of the above 
A)  Vancomycin 
B)  Erythromycin 
C)  Clindamycin 
D)  All of the above

Question 10

What are the effects of the a-hemolysin produced by Staphylococcus aureus?

Accepted Answer

A)  It acts on sphingomyelin in the plasma membrane of red blood cells. 
B)  It kills polymorphonuclear leukocytes. 
C)  It kills macrophages. 
D)  It lyses red blood cells, damages platelets and macrophages, and can cause severe tissue damage. 
A)  It acts on sphingomyelin in the plasma membrane of red blood cells. 
B)  It kills polymorphonuclear leukocytes. 
C)  It kills macrophages. 
D)  It lyses red blood cells, damages platelets and macrophages, and can cause severe tissue damage.

Question 11

All of the following virulence factors are associated with Staphylococcus aureus EXCEPT:

Accepted Answer

A)  Enterotoxins 
B)  Cytolytic toxins 
C)  Cellular components such as protein A 
D)  Endotoxins 
A)  Enterotoxins 
B)  Cytolytic toxins 
C)  Cellular components such as protein A 
D)  Endotoxins

Question 12

Later in the evening,after attending a family reunion,several family members went to the emergency department after experiencing nausea,vomiting,abdominal pain,and severe cramping.When questioned about the food at the family reunion,the menu included fried chicken,hot dogs,hamburgers,potato salad,deviled eggs,éclairs,and cheesecake.The symptoms appeared about 4 hours after they ate.What is the most probable explanation for these symptoms?

Accepted Answer

A)  Staphylococcal food poisoning 
B)  Toxic shock syndrome 
C)  Toxic epidermal necrolysis 
D)  Scalded skin syndrome 
A)  Staphylococcal food poisoning 
B)  Toxic shock syndrome 
C)  Toxic epidermal necrolysis 
D)  Scalded skin syndrome

Question 13

This is a rare but potentially fatal multisystem disease characterized by high fever,hypotension,and shock,and it is associated with highly absorbent tampons.

Accepted Answer

A)  Toxic epidermal necrolysis 
B)  Scalded skin syndrome 
C)  Bullous impetigo 
D)  Toxic shock syndrome 
A)  Toxic epidermal necrolysis 
B)  Scalded skin syndrome 
C)  Bullous impetigo 
D)  Toxic shock syndrome

Question 14

This disease is an extensive exfoliative dermatitis caused by staphylococcal exfoliative toxin.

Accepted Answer

A)  Bullous impetigo 
B)  Folliculitis 
C)  Ritter's disease 
D)  Toxic shock syndrome 
A)  Bullous impetigo 
B)  Folliculitis 
C)  Ritter's disease 
D)  Toxic shock syndrome

Exam 14: Staphylococci

Staphylococcal enterotoxin B is linked to:

The tests used to detect clumping factor will differentiate Staphylococcus aureus from other staphylococcal species.What are these tests?

Infections by this organism are predominantly hospital acquired,and some predisposing factors include catheterization,medical implantation,and immunosuppressive therapy.

This staphylococcus produces wide zones of beta hemolysis on 5% sheep blood agar.

What antibiotic is used for detection of methicillin resistance?

Colony characteristics for Staphylococcus aureus on blood agar after 18 to 24 hours incubation at 35° C include all the following EXCEPT:

This infection occurs secondary to influenza A virus,has a high mortality rate,and occurs among the infants and immunocompromised patients.

What are the effects of the Panton-Valentine toxin produced by Staphylococcus aureus?

Automated antimicrobial susceptibility testing methods are not reliable in detecting these resistant staphylococci.What antibiotic are the bacteria resistant to?

What are the effects of the a-hemolysin produced by Staphylococcus aureus?

All of the following virulence factors are associated with Staphylococcus aureus EXCEPT:

This is a rare but potentially fatal multisystem disease characterized by high fever,hypotension,and shock,and it is associated with highly absorbent tampons.

This disease is an extensive exfoliative dermatitis caused by staphylococcal exfoliative toxin.

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

Streptococcus, enterococcus, and Other Catalase-Negative Gram-Positive Cocci

Aerobic Gram-Positive Bacilli

Neisseria Species and Moraxella Catarrhalis

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Mycoplasma and Ureaplasma

Mycobacterium Tuberculosis and Other Nontuberculosis Mycobacteria

Medically Significant Fungi

Diagnostic Parasitology

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Agents of Bioterror

Biofilms: Architects of Disease

Upper and Lower Respiratory Tract Infections

Skin and Soft Tissue Infections

Gastrointestinal Infections and Food Poisoning

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