"The blood half-life of intramuscular ethyl mercury from thimerosal in vaccines in infants is substantially shorter than that of oral methyl mercury in adults. Increased mercury levels were detected in stools after vaccination, suggesting that the gastrointestinal tract is involved in ethyl mercury elimination. Because of the differing pharmacokinetics of ethyl and methyl mercury, exposure guidelines based on oral methyl mercury in adults may not be accurate for risk assessments in children who receive thimerosal-containing vaccines."
link
"In the case of thimerosal and autism, a growing body of scientifically credible evidence suggests that there may be little to be gained from large additional research investments and, at a minimum, that it is time that additional significant investments in scientific or medical research related to thimerosal and autism be based on credible grounds that would lead one to believe that such investigations will contribute to understanding mechanisms that cause ASD."
link
There have been plenty of other studies on the subject and unless you are willing to believe that the entire scientific community in the western world is engaged in a vast conspiracy to suppress the cause of autism, it isn't thiomerosal/thimerosal. I feel so bad for people with autistic children, I can't even begin imagine how difficult it is for them. But if someone is telling you its thimerosal that caused it and chelation will help or cure it they're taking advantage of you.