Ah, I was already worried then. We all have our own ways to evaluate what is the best for us and our loved ones, and even though I'll give all basic vaccines to my children, as I'm not willing to take risk with some diseases (like tetanus), but I'm on general up for giving more power to our own immune system. All the strength for immune system comes from good food and natural contact with bacteria etc. and one of best things my son can do is to dig some dirt and mud outside.
We can't live in a sterile world and we shouldn't try to do so either.
Sorry, this went a bit off tracks, but I got over excited about human body and it's capabilities :)