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The primary reservoir for staphylococci is:


A) ears.
B) mouth.
C) nares.
D) throat.

E) A) and B)
F) C) and D)

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What disease is an extensive exfoliative dermatitis caused by staphylococcal exfoliative toxin?


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

E) All of the above
F) B) and C)

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


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

E) A) and B)
F) B) and D)

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All of the following is used to describe the colonial morphology of Staphylococcus epidermidis except:


A) b-hemolytic.
B) g-hemolytic.
C) white.
D) small to medium.

E) A) and B)
F) A) and C)

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


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.

E) B) and D)
F) A) and D)

Correct Answer

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Which staphylococcal species is associated with urinary tract infections in young, sexually active females?


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

E) A) and D)
F) B) and C)

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What antibiotic is used for detection of methicillin resistance?


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

E) All of the above
F) C) and D)

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


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

E) C) and D)
F) B) and D)

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A woman in her 20s goes to her physician complaining of burning upon urination, frequency, and general malaise.Her physician does a urine culture, and it grows out 25,000 colony-forming units (CFU) /mL of a catalase-positive, coagulase-negative, novobiocin-resistant gram-positive cocci.What is the most likely pathogen?


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

E) All of the above
F) A) and B)

Correct Answer

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The development of staphylococcal infection is determined by:


A) virulence of the strain.
B) size of the inoculum.
C) status of host's immune system.
D) all of the above.

E) A) and B)
F) A) and C)

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The two most common species of coagulase-negative staphylococci are:


A) Staphylococcus aureus and S.epidermidis.
B) S.capitus and S.lugdunensis.
C) S.epidermidis and S.saprophyticus.
D) S.saccharolyticus and S.epidermidis.

E) C) and D)
F) A) and C)

Correct Answer

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Staphylococci are catalase-positive, gram-positive cocci that resemble other bacteria that are members of what family?


A) Micrococcaceae
B) Streptococcus
C) Escherichia
D) Enterococcus

E) A) and B)
F) A) and C)

Correct Answer

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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?


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

E) C) and D)
F) B) and D)

Correct Answer

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


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.

E) B) and C)
F) C) and D)

Correct Answer

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Showing 21 - 34 of 34

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