Frieden , who took the CDC director job in 2009 , acknowledged that he and other CDC managers failed to recognize a `` critical pattern . '' Executive Director Tom Frieden testified before Congress about anthrax incident . CDC needs to change its research strategy , congresswoman says . Frieden has closed the labs that were involved in the incidents .
Executive Director Tom Frieden testified before Congress about anthrax incident . CDC needs to change its research strategy , congresswoman says . Frieden has closed the labs that were involved in the incidents .