Christmas may have come early to the West African nation of Guinea; a vaccine developed by Merck and tested on 4,000 people in Guinea proved 100% effective. Sakoba Keita, Ebola response coordinator in Guinea called it Guinea's gift to the world and it very well might be.
Conditions of Testing
There are certain medical concerns on the testing methodology. Due to the epidemic nature of the disease and the urgent need for a solution, no placebos were used. The 4,000 people who were vaccinated were in close contact with people actually suffering from the disease. However, the test started March 23 and until now, there has been 100% efficacy, so there are reasons for optimism. Margaret Chan