In the tuberculin skin test, what would be the most likely reason why a positive test would NOT necessarily indicate an infection in progress in a patient who was born and grew up in the United States?

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The TB skin test measures a person's immune response to the bacterium that causes tuberculosis. A positive result indicates that the person has been infected with the bacterium, but it does not necessarily indicate that there is an active infection in progress. The reason for this is that the test measures the response of memory T cells that were formed during an active infection and remain after the infection has cleared. Therefore, the positive result might be due to past exposure to the bacterium rather than a current infection.

In the Tuberculin Skin Test, What Would Be the Most