Question

multiple choice question
the tuberculin test is an example of using an antigen to trigger a type ______ hypersensitivity reaction to diagnose infection.

○ ⅳ
○ ⅲ
○ ⅱ
○ ⅰ

Explanation:

The tuberculin test (Mantoux test) elicits a type IV hypersensitivity reaction, which is a delayed - type cell - mediated immune response. Type I is immediate (e.g., allergic reactions), type II is cytotoxic, type III is immune complex - mediated, and type IV is cell - mediated (delayed) like the tuberculin test.

Answer:

A. IV