Dallas nurse Nina Pham speaks during a news conference at the National Institutes of Health (NIH) in Bethesda, Maryland in this October 24, 2014. Pham was discharged and declared Ebola-free on Friday ... more 
Dallas nurse Nina Pham speaks during a news conference at the National Institutes of Health (NIH) in Bethesda, Maryland in this October 24, 2014. Pham was discharged and declared Ebola-free on Friday after undergoing treatment at the NIH since October 16, 2014. REUTERS/National Institutes of Health/Handout via Reuters (UNITED STATES - Tags: HEALTH)ATTENTION EDITORS - FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS PICTURE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THE AUTHENTICITY, CONTENT, LOCATION OR DATE OF THIS IMAGE. THIS PICTURE IS DISTRIBUTED EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS less 
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Reuters | Photo By HANDOUT / REUTERS
Fri, Oct 24, 2014 4:37 PM EDT