It is unfortunate that there is a low risk of adverse side effects from any vaccine. However, the risk of death from the disease is far higher.
The components of vaccines that cause the side effects are the pieces of pathogens that are meant to activate the immune system. Unfortunately, if your child reacts that strongly to a non-infectious part of a pathogen, the reaction if your child were to catch the disease would be quite severe.
When you catch an infectious disease, the pathogen grows uncontrollably in your body, using your body as food. If the pathogen is a bacteria, it pumps out toxins that can travel all over the body and have serious effects. Viruses literally destroy flesh. It takes 1 to 2 weeks for the humoral immune system to start making disease specific antibodies; by this time, a lot of tissue damage can occur.
I have not read that the severe allergy part of the vaccine was “pathogen caused”. If you have the link, I’d like to read your link.
Japan switched over to a vaccine with LESS SEVERE side effects. I had read about this after my oldest had the TWO increasingly BAD reactions. Hence, the third of the DPT series was switched. Not all the REACTIONS can be classified as to ‘just the pathogen’.
Kanai K. Japan’s experience in pertussis epidemiology and vaccination in the past thirty years. Jpn J Med Sci Biol. 1980 Jun;33(3):107-43.
It is best to be informed, science is not settled and vaccine makers have made mistakes. SV40 (polio) ALV (measles), and rushing vaccine to market without adequate study (GARDASIL), Swine Flu vax.