Cool. It must be 15 or 20 years since my last flu shot and I've very seldom fallen victim to one. I couldn't guess if its been maybe 3 times in that span. A cold here and there but I have this cold smashing technique learned from my wife's MD. Mega dosing D-3 for three days at the first sign of cold symptoms. I've repelled a good many that way stopping the advancement of symptoms. It's not an official thing but I'm a believer.