Prevention is better than vaccination.
Prevention of illness is key. People in trouble because of covid, most of the time are suffering from low grade infection on the inside layer of their blood vessels. Most of the time caused by metabolic disease (hypertension, diabetes 2, obesity and high triglycerides in the blood. Sometimes athletes are building up too much oxidative stress, this also causes low grade infection. In case of Covid these people develop cytokine storm. They can die. Preventive blood test hs-crp shows above 1.0 you need to do something to lower that with healthy foods and vit. D, zinc-methionine, anti-oxidants.