A new nursing student is taking a tuberculin (TB) skin test as part of her preparation for beginning clinical placement in the hospital. The student is unclear of the rationale or physiology involved in this test
Which of the following is the correct explanation?
A)
The cell-mediated hypersensitivity associated with Mycobacterium tuberculosis remains detectable for several years.
B)
Formation of contact dermatitis lesions confirms prior TB contact.
C)
Previous TB exposure forms sensitized Th1 cells that are long-lived.
D)
This type of delayed-type hypersensitivity (DTH) is a response to latent Mycobacterium tuberculosis bacteria.
Ans:
C
Feedback:
Sensitized Th1 cells form DTH response to introduced antigens. This is not an example of cell-mediated hypersensitivity or contact dermatitis, and it is not a response to latent Mycobacterium tuberculosis.
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