THe science sounds fairly simple and straight forward. FACT: My body can become immune to certain diseases if its exposed to them.
Hypthosis: If my body can become immune to disease is it possible to expose my body to a dose that creates an immune response without killing me.
Test: if I were succesfull in getting my body to launch an immune response there should be evidence of antibodies of it in my body.
This isn't hocus pocus where the only proof is some nebulous graphs, stats or ancedotal information. A lab geek can take a sample of blood and see for himself of the body has antibodies.
This crap has to have its roots in chritian science. It fits the play bill of other crap they spout about ritalin and prozac.
Isn't it funny that thimerosal, the preservative used in childhood vaccines for decades, might very well be responsible for depression and ADD? It is VERY interesting that the same company that invented thimerosal also peddles Ritalin and Prozac. Incidently, did you know that all school shootings as of late were perpetrated by those under the influence of a antidepressant and/or Ritalin?
Just because there are antibodies present doesn't indicate that you are immune. Take AIDS for instance. The presence of HIV antibodies indicates you've been exposed to the virus, but it DOESN'T indicate that you are immune...