campaign to vaccinate people at risk of developing Ebola in the latest outbreak in the Democratic Republic of the Congo could begin by the end of this week, Tedros Adhanom Ghebreyesus, the director-general of the World Health Organization, said Sunday.

Tedros said the government of the DRC has formally asked to use an experimental vaccine1 being developed by Merck. The WHO has a stockpile of 4,300 doses of the vaccine in Geneva; the company also has 300,000 doses of the vaccine stockpiled in the United States. Merck has given its permission for the vaccine to be used in this outbreak.

"Everything is ready for the vaccine. They want it,"  Tedros, who goes by his first name, told STAT in an interview from Kinshasa.

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