A positive tuberculin skin test is an example of
A) innate immunity.
B) acute contact dermatitis.
C) psoriasis.
D) delayed cell- mediated immunity.
E) autoimmunity.

Question

Quizplus · Accepted Answer

A positive tuberculin skin test indicates the presence of delayed cell-mediated immunity, specifically a reaction by T cells to the antigen in the test. This response is not immediate, but develops over several hours to days, making it an example of delayed immunity. It is not an example of innate immunity (which includes physical barriers like skin and mucous membranes, as well as innate immune cells like neutrophils and macrophages). It is also not an example of acute contact dermatitis, psoriasis, or autoimmunity.

A Positive Tuberculin Skin Test Is an Example of