http://www.afrol.com/articles/23218

Over the last decade human outbreaks of the deadly Ebola virus in Africa have been repeatedly linked to gorilla and chimpanzee deaths in nearby forests. Hotly debated has been whether these wild ape deaths were isolated incidents or part of a massive die-off. New research published in the journal 'Science' now puts this debate to rest, providing strong evidence that Ebola killed at least 5,000 gorillas at a single site. The study also provides new hope for controlling the devastating impact of Ebola on wild gorilla and chimpanzee populations

Since reports of ape die-offs first circulated widely in 2003, sceptics have doubted how large these die-offs were and whether Ebola was even the cause. The new study, led by Magdalena Bermejo of the University of Barcelona, allays these doubts because it was conducted in a closely monitored gorilla population where genetic tests confirmed Ebola as the cause of death.