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WHO raises risk of Ebola outbreak in Congo to 'very high' at national level
WHO chief deeply concerned by 'scale and speed' of Ebola outbreak in Africa
Since 2015 vaccines for Zaire, the most common Ebola strain, have limited its spread whenever hotspots emerged in Africa.
Two deadly outbreaks that could threaten Americans are unfolding simultaneously—Ebola in one part of the world, hantavirus in another—with mortality rates of 25 to 50 percent and 38 percent, respectively, and no approved vaccines or treatments for either.
On Sunday, the World Health Organization (WHO) declared a public health emergency of international concern, but stressed the outbreak was not a pandemic.
