All of the Following are True for a Positive Tuberculin

Question

All of the following are true for a positive tuberculin skin test EXCEPT that
A) latent tuberculosis is indicated.
B) it signifies active disease in all patients.
C) a delayed-type hypersensitivity reaction occurred.
D) the purified protein derivative is the antigen.
E) redness and some swelling was observed.

Accepted Answer

A positive tuberculin skin test indicates exposure to Mycobacterium tuberculosis, but does not necessarily mean active disease is present. It indicates latent tuberculosis infection, which means the bacteria are present but not causing symptoms. Active disease would be indicated by symptoms such as cough, fever, and chest pain, and would require additional testing and treatment.