超星 - 分枝杆菌--章节练习

单选题

The most common way in which tuberculosis is acquired is via the

A. skin
B. gastrointestinal tract
C. respiratory tract
D. genital tract

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单选题

Mycobacterium tuberculosis can be found in the sputum of patients with tuberculosis. After digestion of the sputum, isolation is the best accomplished using

A. Sheep blood agar
B. Thiosulfate citrate bile salt sucrose medium
C. Lowenstein-Jensen medium
D. Maconkey Agar

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单选题

Pathogenic mechanisms involved in tuberculosis can be primarily attributed to which of the following

A. toxin production by the mycobacteria
B. specific cell adhesion sites
C. cell-mediated hypersensitivity
D. humoral immunity
E. clogging of alveoli by large numbers of acid-fast mycobacteria

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单选题

What test could you do that would immediately indicate that the patient had TB

A. Gram stain of throat swab
B. Gram stain of sputum
C. Acid-fast stain of sputum
D. Australia antigen

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单选题

What result would you expect, based on the finding of acid-fast bacteria, from the PPD test, and when?

A. redness and swelling (>15mm) at the site of injection after 12hours
B. redness and swelling (>15mm) at the site of injection after 24hours
C. redness and swelling (>15mm) at the site of injection after 3 days
D. no reaction at the site of injection

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单选题

Tuberculin test is positive, while the result did not demonstrate any acid-fact bacteria (AFB) in a good sputum sample, what would it mean?

A. the individual definitely does not have active disease, it is an immunological cross-reaction
B. the individual has active TB now, but has not had it in the past
C. he has received BCG
D. the individual has been infected but has no active disease
E. either C or D is correct

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单选题

How is Mycobacterium tuberculosis grown

A. the footpad of the armadillo
B. anaerobically on nutrient broth agar
C. in 5% carbon dioxide at room temperature
D. in 5% carbon dioxide at 37 degrees on Lowenstein-Jensen medium
E. In cultures of human macrophages

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单选题