Just a point...many (if not most) vaccinations do not have any "live" agent in them.
I'm sorry but to
say, "build up your weak immune system
first" is kind of just a pie in the sky fantasy for
some people...such as those who are HIV+ or those with cancer, people undergoing chemo, etc.
In a perfect world yes, we would all be able to
just eat well, live right and pump up our immune system
s...but very few of us live in that perfect world.