In 2014, Sierra Leone, Liberia, and Guinea suffered the worst epidemic of Ebola in history.
The brutal virus spread rapidly through a clinical desert where basic health-care facilities were few and far between.
Causing severe loss of life and economic disruption, the Ebola crisis was a major tragedy of modern medicine.
But why did it happen, and what can we learn from it? Paul Farmer , the internationally renowned doctor and anthropologist, experienced the Ebola outbreak .