BREAKING OUT The Ebola virus, shown in red in this micrograph, infected more than 17,000 people in 2014.
NIAID/FLICKR (CC BY 2.0)
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West Africa’s 2014 Ebola epidemic demonstrated what can happen when a contagious virus emerges amid a population served by a broken medical system, and where cultural practices, public fears and porous borders fuel the spread of disease.