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IIRC, a single concussion puts you are risk for a second one and the percentage is actually pretty high that another one will occur. Not only that, symptoms and effects of successive concussions are additive and are almost set on a multiplier scale.
Again, I'm just referring form memory, but once you have a single concussion, you are at a much higher risk to get a second concussion that will be more severe and can likely occur with less impact than the first.
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