For the first time, health officials will use an experimental vaccine in an effort to stop an Ebola outbreak in its early stages. The last outbreak, in Guinea, Liberia, and Sierra Leone in 2014 and 2015, sickened nearly 29,000 people and killed more than 11,300.
What happened: In its latest count, the World Health Organization (WHO) reported 42 Ebola cases, including 23 deaths, in the Democratic Republic of the Congo between April 4 and May 13.
How the vaccine works: Manufactured by Merck, it uses an animal virus that’s harmless to humans to carry a gene that makes an Ebola protein. No Ebola drug or vaccine, including Merck’s, has been approved yet by a regulatory agency, such as the US Food and Drug Administration.
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