USDA investigation into anthrax exposure at CDC finds other lab safety problems . The Centers for Disease Control and Prevention has been investigating the 2001 anthrax attacks on U.S. biodefense labs in Fort Detrick, Maryland, since late last year. The CDC director is `` upset '' and `` angry '' that it happened .
USDA investigation into anthrax exposure at CDC finds other lab safety problems . CDC investigation concluded no lab workers were infected with anthrax . The CDC director is `` upset '' and `` angry '' that it happened .