Anonymous
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You don't have a "flare-up" from COVID. A "flare-up" implies that you are constantly living with a certain health issue. (like a flare-up of arthritis or a flare-up of gout - conditions that are always in your body but can have good days and bad days.)
COVID is like the flu - once your body fights it off - it is gone. You can't "relapse".
You could CATCH COVID again. Just like you can get the flu more than once - it is believed that you can catch COVID again.
And - yes - the next time you get COVID - there is a risk it could be fatal.