c. Delayed hypersensitivity d. Anaphylactic type
Ans: C. Delayed hypersensitivity: A non-immunized person by a tuberculin skin test, which yields a delayed hypersensitivity type response to purified protein derivatives of M. tuberculosis. Those immunized for TB or with past-cleared infection will respond with delayed hypersensitivity parallel to those currently in a state of infection and thus the test must be used with caution, particularly with regard to persons from countries where TB immunization is common.
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