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U.S. House committee on Veteran's Affairs chairman, Congressman Bob Filner , D-CA, listens to testimony during a special hearing Tuesday, July 13, 2010 at the Thomas Eagleton U.S. Courthouse in St. Louis. The committee is looking into incidents at a St. Louis VA medical center where more than 1800 veterans were possibly exposed to viruses including hepatitis B, hepatitis C and HIV due to improperly sterilized dental instruments.(AP Photo/Tom Gannam) Tom Gannam/AP