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In What Year Was The First Genetic Test Done?

What is a Two-step PPD test? The first test was negative so why do I have to get another one done?

  • Is this a new procedure that I don't know about? If the first test is negative why get another one? I was just wondering.

  • Answer:

    Most health care workers are require to receive a two step PPD test. It is possible that where you work at you could be expose to TB and that is why they are requiring a two part test.

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