The deadliest Ebola outbreak in recorded history is happening right now. The outbreak is unprecedented both in the number of people who have gotten sick and in geographic scope. And so far, it's been a long battle that doesn't appear to be slowing down.
The Ebola virus has now hit five countries: Guinea, Liberia, Sierra Leone, Nigeria, and Senegal.
The virus — which starts off with flu-like symptoms and sometimes ends with bleeding — has infected about 3,700 people and killed more than 1,800 since this winter, according to estimates on September 4 from the World Health Organization.