Nancy Writebol, a Charlotte, North Carolina native, was working in Liberia for a charity when she caught the terrifying disease. American doctor Kent Brantly was already being treated at a hospital in Monrovia, Liberia after he tested positive. Two high profile Ebola researchers from Sierra Leone and Liberia have also caught the illness – one died Sunday. The virus has appeared in large West African cities for the first time. An outbreak in heavily populated Lagos, Nigeria could be devastating. The excruciating and grisly illness causes victims to bleed from the skin and kills 90 percent of those infected.