U.S. CDC says it 'may never know' how bird flu mishap occurred

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U.S. CDC says it 'may never know' how bird flu mishap occurred

<p><a href="http://news.yahoo.com/u-cdc-says-may-never-know-bird-flu-211133870.html"><img src="http://l.yimg.com/bt/api/res/1.2/TzsH9i06hSrFqLoQ4_c3gA--/YXBwaWQ9eW5ld3M7Zmk9ZmlsbDtoPTg2O3E9NzU7dz0xMzA-/http://media.zenfs.com/en_us/News/Reuters/2014-07-21T211133Z_1_LYNXMPEA6K0T9_RTROPTP_2_USA-ANTHRAX.JPG" width="130" height="86" alt="CDC Director Frieden testifies before a hearing on Capitol Hill in Washington" align="left" title="CDC Director Frieden testifies before a hearing on Capitol Hill in Washington" border="0" /></a>By Julie Steenhuysen CHICAGO (Reuters) - The U.S. Centers for Disease Control and Prevention &quot;may never know&quot; 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. The CDC disclosed the bird flu incident as part of an internal investigation into the agency's mishandling of live anthrax in June, potentially exposing dozens of its own lab workers to the pathogen. While no humans fell ill as a result of the bird flu breach, CDC Director Dr Thomas Frieden has called it “the most distressing&quot; in a series of safety breaches at the agency because of the public risk posed by the virus.</p><br clear="all"/>

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