The death toll from the Ebola outbreak in West Africa has topped 1,900, including around 400 over the past week. There are around 3,500 confirmed cases in Liberia, Sierra Leone, Guinea, Nigeria and Senegal. Margaret Chan of the World Health Organization said the scale of the outbreak is unprecedented.

Margaret Chan: “This Ebola epidemic is the largest and most severe and most complex we have ever seen in the nearly 40-year history of this disease. No one, even outbreak responders with experience dating back to 1976, to 1995, people that were directly involved with those outbreaks, none of them have ever seen anything like it.”