What are the Ebola vaccines under research, and when will they be ready?

East Africa is currently in the throes of a rapidly spreading Ebola epidemic, with governments scrambling to contain the virus and hundreds of people confirmed with the infection.

The outbreak of the viral haemorrhagic fever, which has been triggered by a rare and deadly strain of Ebola, was first declared by the Africa Centres for Disease Control and Prevention on May 15 in the conflict-wracked...