I do understand that there are adverse reactions that could be caused. However, if you have read the insert and/or packet of information that the doctor's office has given you, you would see that the incidence of such serious reactions is extremely unlikely and low. The most common thing would be either pain in the area or a fever, and anything more than that is highly unlikely due to the statistics of each vaccine. Yes, some have more problems than others, but the ability to be immune (or even partially immune) far outweighs the risk of some of these adverse reactions, the majority of which are both mild and short term.