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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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
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
The most common way in which tuberculosis is acquired is via the
A. Skin
B. Gastrointestinal tract
C. Respiratory tract
D. Genital tract
E. Nasal tract
Disease manifestations in TB are largely the result of which of the following
A. cytotoxicity
B. immunosuppression
C. cellular immune response
D. antigenic cross reactivity
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