They also found that those with severe disease had some dysfunction in their blood vessels and problems with blood clotting. There were three important differences in those with severe disease. Those with severe disease required ventilation and dialysis. In the outbreak in West Africa that peaked in 2014, about half of people infected with the virus survived. They then categorized the patients into two groups — those with moderate disease and those with severe disease that was based on the kind of support they needed.

Source: Washington Post June 30, 2016 18:11 UTC