On Monday the U.S. Court of Federal Claims began hearing the first of nine test cases to determine if vaccines cause autism in children. The test cases could ultimately determine the outcome of 5,000 similar claims.

In the first test case, the parents of a 12 year old contend that their duaghter's vaccines contained a preservative called thimerosal. This preservative, they allege, weakened their daughter's immune system. Consequently, their daughter now suffers from severe autism.