FILE - The main building of the National Institutes of Health is seen in Bethesda, Md., in this Aug. 17, 2009 file photo. Ten clinicians with a Boston-based nonprofit organization responding to the Ebola outbreak in Sierra Leone are to be transported to the United States after one of their colleagues was infected with the deadly disease. The clinician who became infected has already been evacuated and is receiving treatment at the National Institutes of Health. (AP Photo/J. Scott Applewhite, File)
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