The second known U.S. case of autism was the son of a researcher who worked with mercury, a new report found by determining the previously unknown identities of the first three known autism cases. The first and third cases may also have grown up in the vicinity of ethyl mercury products. That lends support to parents and some scientists who blame ethyl mercury, the active ingredient in a vaccine preservative, for the rising autism rate, but it may be mere coincidence, says a CDC spokesman. Science Daily Magazine/United Press International
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