Chemical structure of thiomersal. The large, light grey atom is the dreaded "Hg".
The autism omnibus trial stems from nearly 5000 lawsuits that have been filed claiming that vaccines have caused autism in young children who received them. The omnibus was created to handle this overwhelming caseload in 2007. The case concluded in February 2009, ruling that the plaintiffs who claimed MMR and thiomersal-containing vaccines caused autism were not entitled to compensation.
This article discusses many of the aspects of the cases as well as the evidence presented.