Question

an example of using a type iv (delayed) allergy reaction to diagnose infection with mycobacterium tuberculosis is the \boxed{} reaction.

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Explanation:

To diagnose Mycobacterium tuberculosis infection using a type IV (delayed) hypersensitivity reaction, the Mantoux test (also known as the tuberculin skin test) is used. This test involves injecting tuberculin (a purified protein derivative from M. tuberculosis) into the skin and observing for a delayed - type hypersensitivity reaction (usually within 48 - 72 hours) which indicates prior exposure or infection with the bacterium.

Answer:

Mantoux (or tuberculin)