CDC Director Dr. Julie Gerberding has delivered a potentially explosive report to the powerful House Appropriations Committee, in which she admits to a startling string of errors in the design and methods used in the CDC's landmark 2003 study that found no link between mercury in vaccines and autism, ADHD, speech delay or tics. Gerberding was responding to a 2006 report from the National Institute of Environmental Health Sciences (NIEHS), which concluded that methodology such as that used in the CDC's flagship thimerosal safety study is riddled with "several areas of weaknesses" that combine to "reduce the usefulness" of using the data in such a way.

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