Its not that simple. Some vaccines are good some aren't. It may build up the immunity or it may just introduce foreign junk that shouldn't be there in the first place. Some vaccines are more effective and it is very much person dependent. There is not one size fits all answer. There is always a risk/reward to consider with any medication. What I don't like about them is that they are being pushed on you. You should be able to decide for yourself whether you would like the vaccination or not.