I am fully vaccinated and got the booster 6 months before being infected. I was hit with a large viral load (sitting next to the covid positive cyclist for 2 hours) and glutened at the same time (celiac), so a double cytokine storm. Being older with some autoimmune diseases likely means my immune system isn't as sturdy as a younger person. My stress and other tests all came out negative for any damage, so I'm good to start ramping up the exercize.