Just as an fyi, there are things out there that are far more effective than the flu vaccine. Many articles have come out questioning the efficacy of it... they were particularly asking if it actually does induce herd immunity. I think the conclusion was that it is not strong enough to induce herd immunity. Look up Oster and his findings. There was also study showing colostrum being 3x more effective at preventing influenza.
I wouldn't go as far as calling it useless, but the strains change every year and there's no way to guarantee protection against all strains.
Work on raising vitamin D levels to guarantee surefire immunity against it. Invest in a decent COD liver oil brand.
Post Edited (Guardian7) : 10/29/2015 5:54:31 PM (GMT-6)