The experimental Ebola vaccine being used to try to contain the outbreak in the Democratic Republic of the Congo is protective 97.5% of the time, according to new data released by the World Health Organization on Friday.

The data — the first to be released on how the vaccine is working in the outbreak — suggest a “very impressive” performance by the vaccine, said Michael Osterholm, director of the University of Minnesota’s Center for Infectious Diseases Research and Policy, who reviewed the report for STAT.

Credit: National Institute of Allergy and Infectious Diseases (NIAID)

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