Although this study has scientific merit and advances our knowledge of autism, please don't get too excited regarding it's actual impact on diagnosing autism per se. Many neurological disorders (autism, schizophrenia, depression, etc.) have been hypothesized to have some immunological component. I'm not convinced that we will be able to use immune system markers to differentiate among the various disorders linked to infection and/or autoimmune abnormalities using today's technology. Maybe in the future this will be possible, but I don't want anyone getting their hopes up too soon.