ariputra, I don't feel like going into explanations right now, but people who scare others with talk about vaccinations are dangerous fools! At least read this short article: http://ru.wikipedia.org/wiki/%D0%92%D0%B0%D0%BA%D1%86%D0%B8%D0%BD%D0%B0%D1%86%D0%B8%D1%8F
Damn, well, here's a simple example: everyone knows that if you stick 2 fingers into an outlet, you'll get an electric shock that can kill you - but no one is demanding that, for that reason, the use of electricity be banned?! Although, of course, it's your right to live without electricity! ;)