59.Tuberculosis is immunologically mediated disorder of

a. Autotoxic type b. Immune complex disease
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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