Which of the following is a true statement about the tuberculin skin test?ANSWERIt detects exposure to Mycoplasma tuberculosis.It is a classic example of a type I hypersensitivity reaction.For the test, PPD is injected into the skin of the forearm.The test can differentiate between natural exposures and vaccination against tuberculosis.
Question
Which of the following is a true statement about the tuberculin skin test?ANSWERIt detects exposure to Mycoplasma tuberculosis.It is a classic example of a type I hypersensitivity reaction.For the test, PPD is injected into the skin of the forearm.The test can differentiate between natural exposures and vaccination against tuberculosis.
Solution
The true statement about the tuberculin skin test is: "For the test, PPD is injected into the skin of the forearm."
Here's why:
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The tuberculin skin test does not detect exposure to Mycoplasma tuberculosis. It detects exposure to Mycobacterium tuberculosis.
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The tuberculin skin test is not a classic example of a type I hypersensitivity reaction. It is a type IV hypersensitivity reaction, also known as a delayed-type hypersensitivity reaction.
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For the test, purified protein derivative (PPD) is indeed injected into the skin of the forearm. This is a true statement.
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The test cannot differentiate between natural exposures and vaccination against tuberculosis. A positive result can be due to a current infection, a past infection, or vaccination with the Bacillus Calmette-Guérin (BCG) vaccine.
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