I'm not saying, in principle, that vaccination will always be perfect. The way I look at it:
- In principle the wrong vaccination can program immune system in a way that increases risk for some other viruses.
Or just some other mutation of the same virus. Yes, we're finally getting somewhere. This risk indeed exists and it even has its name: Antibody-dependent Enhancement (ADE) of vaccines. Its point is, coronavirus utilizes cytokine storm for entering the organism, because it's derived from HIV virus, which is immune cell killer, not victim. And vaccine makes cytokine storm worse. Nothing very new in the matter of vaccines, SARS vaccines in particular. Every experienced epidemiologist knows, it's dangerous to start with vaccination program in the middle of pandemics: now only it escalates risk for ADE, but it also enhances probability of mutation of new resistant strains, as it just did happen in India with delta variant of coronavirus.