Research into Gulf War syndrome has revealed a better insight into how vaccines work
How Vaccinations Work - Th1/Th2 Immune Response
What raised my eyebrow, and doubts, was this-
"In individuals in whom the Th1 function predominates, causing many acute inflammations because the cellular immune system is overreactive, a vaccination could have a balancing effect on the immune system and be helpful for that individual.
In individuals in whom the Th2 function predominates, causing few acute inflammations but rather the tendency to chronic allergic or autoimmune inflammations, a vaccination would cause the Th2 function to predominate even more, aggravating the imbalance of the immune system and harming the health of that individual. This is what happened in Gulf War Illness.
The current use of vaccinations in medicine today is essentially a "shotgun" approach which ignores differences among individuals. In such an approach some individuals may be helped and others may be harmed."