In this Oct. 8, 2013, file photo, a sign marks the entrance to the federal Centers for Disease Control and Prevention in Atlanta. Michael Farrell head of the Centers for Disease Control and Prevention lab that potentially exposed workers to live anthrax, resigned an agency spokesman said Wednesday, July 23, 2014. Farrell was reassigned following an incident last month at an Atlanta lab that handles bioterrorism agents. (AP Photo/David Goldman, File)
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