I had my covid vaccine last week with mild side effects, I know several people who have now had it, with a range of severity of the side effects. A friend said she heard that the severity of side effects mirrors how badly you would have had covid , had you caught it. I've tried to Google this but no luck and although I understand how vaccines work, I don't have a good enough understanding of them to work out if this can logically be true. Is this right?