(NBC NEWS) The head of the government lab that potentially exposed workers to live anthrax has resigned, an agency spokesman said Wednesday.

Michael Farrell was head of the Centers for Disease Control and Prevention lab since 2009. He submitted his resignation Tuesday, the spokesman said.

Farrell was reassigned following an incident last month at an Atlanta lab that handles bioterrorism agents. The lab was supposed to completely kill anthrax samples before sending them to two other CDC labs that had fewer safeguards, but didn’t.

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