Mycobacterium tuberculosis has traditionally been identified in patient samples using biochemical tests, and more recently through DNA probe analysis. In vivo testing can also be completed using the tuberculin skin test. A more recent test that seems to be surpassing the others is the QuantiFERON-TB gold test. Blood samples are mixed with protein antigens of M. tuberculosis. After 16 to 24 hours of incubation, the amount of the cytokine interferon produced by the patient's cells is measured. If the patient is infected with M. tuberculosis, their WBCs will release interferon in response to contact with the tuberculosis protein antigens. This test falls under which category of identification tests?
A. DNA fingerprinting test
B. Microarray test
C. Immunologic test
D. Enzymatic test
E. Genotypic test
Answer: C
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