题目内容

Which of the following statements regarding the role of protein A in the pathogenesis of infections caused by Staphylococcus aureus is correct?

A. It is responsible for the rash in toxic shock syndrome
B. It converts hydrogen peroxide into water and oxygen
C. It is a potent enterotoxin
D. It is directly responsible for lysis of neutrophils
E. It is a bacterial surface protein that binds to the Fc portion of IgG1

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S. pneumoniae can be part of the normal flora of 5–40% of people. At what anatomic site can it be found?

A. Conjunctiva
B. Nasopharynx
Colon
D. Urethra
E. Vagina

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Enterococci can be distinguished from nonenterococcal group D streptococci on the basis of which of the following characteristics?

A. γ-Hemolysis
B. Esculin hydrolysis
C. Growth in 6.5% NaCl
D. Growth in the presence of bile
E. Gram stain morphology

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Which of the following cell components produced by Neisseria gonorrhoeae is responsible for attachment to host cells?

A. Lipooligosaccharide
B. Pili (fimbriae)
C. IgA1 protease
D. Outer membrane porin protein
E. Iron-binding protein

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All of the following statements regarding Panton–Valentine leukocidin are correct except

A. It is a two-component toxin
B. It is commonly produced by community-associated MRSA strains
C. It is an important virulence factor
D. It is identical to one of the staphylococcal enterotoxins
E. It forms pores in the membranes of white blood cells

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Which of the following statements regarding the role of protein A in the pathogenesis of infections caused by Staphylococcus aureus is correct?

A. It is responsible for the rash in toxic shock syndrome B. It converts hydrogen peroxide into water and oxygen C. It is a potent enterotoxin D. It is directly responsible for lysis of neutrophils E. It is a bacterial surface protein that binds to the Fc portion of IgG1

S. pneumoniae can be part of the normal flora of 5–40% of people. At what anatomic site can it be found?

Enterococci can be distinguished from nonenterococcal group D streptococci on the basis of which of the following characteristics?

Which of the following cell components produced by Neisseria gonorrhoeae is responsible for attachment to host cells?

All of the following statements regarding Panton–Valentine leukocidin are correct except

A. It is responsible for the rash in toxic shock syndrome
B. It converts hydrogen peroxide into water and oxygen
C. It is a potent enterotoxin
D. It is directly responsible for lysis of neutrophils
E. It is a bacterial surface protein that binds to the Fc portion of IgG1