I swear by the flu shot.  I get one every year and I have been doing pretty
well in not getting so sick with whatever yearly bug comes down the pike the
way I used to.   But that doesn't mean I never can catch anything, I know it
just immunizes me from one or two of the ones making the rounds.   A couple
of times my husband has gotten very sick with cold/flu and I escaped it, so
maybe it was the flu shot that prevented it, and maybe it was just luck.

I do love green tea, not for any special health benefit, but because it
tastes so good.   I also like regular tea with a piece of lemon squeezed
into it.   Maybe the vitamin C from the lemon is helpful.