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A member asked:
Can they inject tb into your body for the test?
A doctor has provided 1 answer
No: The TB test is based on exposure to some proteins that are present in the TB bug. So the injected solution is purified protein derivative (PPD) that is derived from those proteins obtained from the killed TB bugs through a series of steps. There is no live TB bug in PPD solution that is used for TB test.
Answered 6/10/2014
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Why do we do TB tests, and not just vaccinate against tb?
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