Scientists have uncovered the history of Ebola, and it dates back much further than they expected.
The research shows that filoviruses, a strain to which Ebola and its similarly lethal relative, Marburg, is at least 16-23 million years old.
Good news is the discovery could help find new ways to create a vaccine.
The research does not provide the age of the modern-day Ebola virus.
Instead, it shows how Ebola and Marburg are each members of ancient evolutionary lines, and that these two viruses mutated down the line and last shared a common ancestor sometime prior to 16-23 million years ago.