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I highly doubt that mercury is responsible for skyrocketing levels of autism, YET, I do believe mercury is a dangerous metal which should NEVER be put into your body even in trace amounts, as for any toxic substance, just because there is not enough of the substance in you to kill you or have noticable damage does not mean it isn't harming you. I am sure the mercury in vaccines could be responsible for several different things such as "ADHD" being overdiagnosed and some brain damage.