We actually have quite a bit of data on myocarditis not just in non-elderly non-deathfat people, but specifically in kids:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6352488/
archive
Let's learn together about the most common presentations of myocarditis in the pediatric population.
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Oh what's this at the TOP OF THE LIST? Sudden death.
This paper is from 2019, so, the before-times but very up-to-date.
Let's assume you are one of the lucky ones who is sick enough to let mommy know to take you to the doctor, but not so sick that you just go to bed one night and never wake up. What's the outlook?
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Your most optimistic odds are a 7% chance of dying. And that's really stretching the optimism:
And if you survive, your odds of improvement (ie not being a lifelong invalid) are 50/50ish.
So that seems grim...
oh yeah and if you don't die, you have decent odds of needing transplant: