Trials conducted in Guinea, one of the West African countries most affected by an outbreak of Ebola that ended this year, show it offers 100% protection.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/ebola-experimental-vaccine-highly-effective-trial-shows
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/bbc-uk
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ebola-virus-disease-ebola-hemorrhagic-fever-0
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/infectious-diseases
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vector-borne-diseases
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/epidemics
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/guinea
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sierra-leone
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/africa
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/preventive-medicine
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/medical-research