On the contrary, his autistic brother, who is 5 years older, had exceeded the allowable level of mercury (from thimersol) in his body by the time he was 15 months old; and that is when the first signs of autism presented. Home videos show a normal baby until he was 15 months old when he started regressing.
He has been treated with the casein free diet and with other dietary treatments. Although he has been diagnosed with certain gastrointestinal problems, the special diets did not seem to help much. Perhaps they were started too late (5 years old).