The 2014 Ebola outbreak in West Africa has killed more people than sum total of all the previous outbreaks since the virus was first identified in 1976. Today, the first-ever case in the United States was diagnosed. Vox health reporter Julia Belluz explains in two minutes how the outbreak spiraled completely out of control.
Further reading: See Vox's 14 facts you should know about the Ebola outbreak, and here is list of aid groups working on the Ebola crisis and how to donate.