Well I got Covid shots and all the boosters.....Still got Covid. So, I can't dispute what you say. As far as the yearly flu shot, I've always wondered if it really worked. Sometimes I got sick and sometimes not. When I was a kid it used to be called catching a cold. It could make you feel pretty shitty, snotty nose, no smell, cough ear infection, etc. Now it's called an 'epidemic.' Today we need to wear masks, shut down businesses and schools, stay 10ft away from each other, quarantining ourselves for 2 weeks at the outset of a sniffle.