There was a 42 year old professional firefighter who died in my hometown with Covid. He wasn't old or frail. Neither were the other 16 other firemen who came down with it, including the 3 others that were hospitalized for weeks. This virus behaves very differently with those it infects.
There was a local cop here mid-40's, good shape, takes care of himself and trains. Guy is a lot like me age, health, training...except I'm an insulin dependent diabetic. Couple of days after he got it he had to check into the hospital. About a week later he passed away.
I worked out earlier in the day that I first started having symptoms, felt fine. Fever for a little less than 24 hours, almost no cough, a little snotty....really the 24 hours with a fever was the only time I could tell I was sick. I've got allergies so bad I can be snotty at any time. Took 4 days off from the day symptoms started before working out again....I wouldn't have known I had been sick.
It was like a 24 hour bug to me but killed another guy who does the same things I do. It really is crazy how it's so different between people.