FILE - In this Sunday, Oct. 19, 2014 file photo, Margaret Chan, Director General of the World Health Organization (WHO), addresses the media during a news conference held in an hotel in Gammarth, northeastern Tunisia. Drugmakers are racing to develop vaccines and drugs to address the worst outbreak of Ebola in history. It's unclear who will pay for their products, but companies are betting that governments and aid groups will foot the bill. (AP Photo/Adel Ben Salah, File)
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