And here it becomes very tricky. We spent a good portion of this book talking about the fact that your Adaptive Immune System does not just activate by itself. It needs the Innate Immune System to make the decision to activate it, and for that you first need a battleground. An environment that can push your Innate Immune Cells to escalate an immune reaction. How exactly these things happen is hard to say and even harder to observe in living humans—people get sick all the time but only extremely rarely does this lead to anything more than an infection that is cleared out eventually. But for
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