CDC says it 'may never know' cause of bird flu mishap

July 22, 2014 11:33 AM

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CDC says it 'may never know' cause of bird flu mishap

U.S. Centers for Disease Control and Prevention (CDC) Director Thomas Frieden testifies before the hearing on ''Review of CDC anthrax Lab Incident'' on Capitol Hill in Washington July 16, 2014. (CREDIT: REUTERS/KEVIN LAMARQUE)

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.

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