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I don't know how rare resistance is, but it seems the real question is about resistance coming and going. Yes, resistance can come and go for individuals over their lifetime. Exposure, or long pe...
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#1: Attribution notice removed
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System
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2020-06-03T15:54:24Z (over 4 years ago)
Source: https://outdoors.stackexchange.com/a/16820 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/