FILE – In this Wednesday, May 30, 2018 file photo, a healthcare worker from the World Health Organization prepares vaccines to give to front line aid workers, in Mbandaka, Congo. The vaccine alliance GAVI has announced on Thursday, Dec. 5, 2019 it would invest $178 million to create a global stockpile of about 500,000 Ebola vaccines, in a move health officials say could help prevent future outbreaks from spiraling out of control. GAVI is a public-private partnership that includes the World Health Organization, UNICEF, the Bill & Melinda Gates Foundation and the World Bank, among others. (AP Photo/(AP Photo/Sam Mednick, file)

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