Only anecdotal I know but the people we know who have been severely affected by covid ( except two older aquaintances with multiple heath issues who died) have all been young, extremely fit ( marathon runners etc.) and very healthy.
For example, the man who probably infected DH back in April ( who in turn got me) is in his 30’s, was super fit and covid has floored him, he wasn’t hospitalised at the time but his wife was and she hasn’t been as badly affected.
10 months on he’s still not back at work full time and is severely short of breath on the mildest exertion.
What is causing such damage?
Is it the initial viral load exposure?
Is it because he was left untreated so his lungs were ravaged?
Does being super fit mean that your immune response over reacts and makes things worse? (Is that what cytokine storm is?).
It’s horrifying and fascinating in equal measure.