The largest Ebola outbreak in history started in Guinea in December 2013, spread to Liberia by March 2015 and into Sierra Leone by May 2015. The World Health Organization (WHO) declared the outbreak a public health emergency of international concern in August 2014. Sierra Leone, Liberia and Guinea had not experienced an Ebola outbreak before and so understanding of prevention measures and trust in public information was extremely low.
The deadly Ebola virus has claimed more than 2,400 lives throughout five affected West African countries. More than half of Ebola-related deaths have been in Liberia.