U.S. CDC says it 'may never know' how bird flu mishap occurred
Monday, July 21, 2014 - 16:40
in Health & Medicine
CHICAGO (Reuters) - The U.S. Centers for Disease Control and Prevention "may never know" how a fairly harmless form of bird flu was cross-contaminated with a dangerous bird flu strain before it was sent to a laboratory outside of the CDC, an agency spokesman said on Monday.