The Amish do not believe in vaccines.
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Oddly, the Amish also have almost no Autism cases.
There have been 3 verified cases of autism in the Amish, and two of those children were vaccinated. No information is available for the third child, who was likely vaccinated himself.
Dan Olmstead's claims about "no Amish autism" have been debunked.
The Amish do vaccinate, and they do have autism:
The idea that the Amish do not vaccinate their children is untrue, says Dr. Kevin Strauss, MD, a pediatrician at the CSC. We run a weekly vaccination clinic and its very busy. He says Amish vaccinations rates are lower than the general populations, but younger Amish are more likely to be vaccinated than older generations.
Strauss also sees plenty of Amish children showing symptoms of autism. Autism isnt a diagnosis its a description of behavior. We see autistic behaviors along with seizure disorders or mental retardation or a genetic disorder, where the autism is part of a more complicated clinical spectrum. Fragile X syndrome and Rett Syndrome is also common among the clinics patients.
Strauss, along with Dr. D. Holmes Morton, MD, authored a study published in the New England Journal of Medicine which described a mysterious seizure disorder that resulted in mental retardation and autistic behavior in nine Amish children. The study was published one year after Olmsteds mythic voyage, so it would seem a story correction would be in order.