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I have never had TB but have had multiple TB tests for work. All negative. If you are introducing TB antigen with each test, why isn't a memory of that formed by the adaptive immune system?

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  • $\begingroup$ It's an interesting question; I've had PPDs yearly for decades. May I ask what you found when you tried to answer this question with a search? Please edit your findings into you question and refine your question accordingly. Thanks! $\endgroup$ Feb 12, 2022 at 16:03

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