A sign is seen at the main facility for the Centers for Disease Control and Prevention in Atlanta, Georgia in this June 20, 2014 file photo. As U.S. lawmakers investigate the anthrax and bird flu ... more 
A sign is seen at the main facility for the Centers for Disease Control and Prevention in Atlanta, Georgia in this June 20, 2014 file photo. As U.S. lawmakers investigate the anthrax and bird flu breaches at a federal laboratory, they have begun to question whether outside oversight of research using dangerous microbes is as independent as federal agencies claim.'To match Insight HEALTH-ANTHRAX/OVERSIGHT REUTERS/Tami Chappell/Files (UNITED STATES - Tags: HEALTH POLITICS) less 
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Reuters | Photo By TAMI CHAPPELL / REUTERS
Wed, Aug 13, 2014 1:02 AM EDT