The research is pointing to the possibility that if western society continues on this path that we may actually divide into two subspecies as reproduced in lab studies using rats and mice. Dr. Parker from Duke University had this to say on the subject as reported by The New York Times.
"Since time immemorial, a very specific community of organisms microbes, parasites, some viruses has aggregated to form the human superorganism. Mounds of evidence suggest that our immune system anticipates these inputs and that, when they go missing, the organism comes unhinged.
Future doctors will need to correct the postmodern tendency toward immune dysregulation. Evolution has provided us with a road map: the original accretion pattern of the superorganism. Preventive medicine will need, by strange necessity, to emulate the patterns from deep in our past."
Perhaps every immunization shot, should come with a sand box for kids to play in?