You can recover. If you get a disease and then don’t get tested for a couple of weeks then your body may have developed antibodies to handle it. If you get a test for an active virus then, it will turn out negative. That’s why they have separate serology tests that say “You have immunity to chicken pox, you either had it or had got a vaccine”. Those aren’t the same tests as are used to detect if you have a disease right now.
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