Final answer:
The most common method to test for tuberculosis is the skin test, where a reaction is observed after 48-72 hours.
Explanation:
The most common method to test for tuberculosis is the skin test. In this test, a small amount of tuberculin protein derivative is injected under the skin, and the reaction is observed after 48-72 hours. A positive result is indicated by redness, swelling, or hardness.
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