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How deadly is the Ebola virus? It鈥檚 often said that it kills up to 90% of victims, but while that鈥檚 true of one outbreak, the death rate in other Ebola outbreaks has varied widely.

More or Less investigates what we know about how dangerous Ebola is, what factors might influence whether people survive once they鈥檙e infected, and how likely it is that there might be an outbreak of the virus in the United States or Europe.