Ebola is the single biggest threat to the survival of gorillas and chimpanzees, having wiped out a third of their populations since the 1990s.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/ebola-great-apes-need-vaccine-too-virus-has-wiped-out-third-their-numbers-past-outbreaks
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/international-business-times
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ebola-virus-disease-ebola-hemorrhagic-fever
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/infectious-diseases
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/epidemics
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vaccination
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/animal-diseases