The theory of Original Iatrogenic Sin holds that when one is vaccinated, the immune system learns one way to respond and forgets its alternative pathways. As the initial titer benefit fades over time, people are thus predicted to be worse off. The studies don't look at this.
Also they don't look much at whether the vaccine recruited resources to fight one disease, hamper response to others, especially over time.
For measles, for example, according to published reports, 3/4 of the population is subject to a sub-clinical infection involving flu like symptoms and possible contagion, but not the charactertistic rash, only 7 years from their last booster, and protection wains further from there. At what if any point vaccinated patients have a higher expectation of becoming badly sick if exposed to measles than unvaccinated patients is utterly unknown, and nothing also is known about susceptibility to other diseases. http://truthsift.com/node_info?nid=5284&superNode=No&subNode=No&isFlagged=No&probability=1&likelihoodEstimateT=0.5&likelihoodEstimateF=0.5&likelihoodEstimate=0.5&rating=TE