A tip that works for me. Keep you bodies PH high by eating lots of chocolate and Orange juice. Or anything with lots of vit C.
Makes it so the flue cant live in your body. If you do get the flu it will be so mild you will hardly notice it.
My wife and son just got over the flu. Lasted them about 4days. Both were bed ridden. I got a 1 degree rise in my temperature but felt fine.