A new vaccine for the Ebola virus has been very effective, according to preliminary results of a clinical trial.
The VSV-EBOV vaccine's medical trial in Guinea was recently published in the medical journal "Lancet."
Guinea, Liberia and Sierra Leon and other West African countries have suffered Ebola outbreaks.
Thousands (reported numbers vary between 2000-4000) of close contacts of Ebola patients were immediately vaccinated in April and July, and did not get Ebola. However, 16 close contacts were vaccinated three weeks later, and became infected.
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The World Health Organization said the vaccine could be a "game-changer," and may eventually be 75 to 100 percent effective, notes the BBC.
The vaccine combines a small dose of the Ebola virus and second safe virus to create a human immunity to Ebola.
"This is an extremely promising development," Dr. Margaret Chan, director-general of the World Health Organization, told the Daily Mail.
"Early results of the vaccine are exciting and promising. If they are confirmed it will change the management of the Ebola outbreak," Chan added.