Test Ebola drug 100% effective, says researchers.
The only clinical trial data on the experimental Ebola drug ZMapp shows it is 100% effective in monkey studies, even in later stages of the infection.
The researchers said it was a "very important step forward".
Yet the limited supplies will not help the 20,000 people predicted to be infected during the outbreak in West Africa.
Two out of seven people given the drug have later died from the disease.
ZMapp has been dubbed the "secret serum" as it is still in the experimental stages of drug development with, until now, no public data on effectiveness.