Also keep in mind parasites and gut bacteria are far different to infectious diseases like polio and measles. We are rapidly approaching an era of medical trea

Also keep in mind parasites and gut bacteria are far different to infectious diseases like polio and measles. We are rapidly approaching an era of medical treatments where giving a treatment of "probiotics" to correct your newborn child's gut bacteria in order to prevent asthma much the way we give immunisations against diseases today. The hygiene hypothesis is getting some pretty compelling evidence and hopefully it will lead to us learning the "right" kind of things we should be exposing our children to in order to prevent these autoimmune conditions.