A range of drugs and vaccines are being studied to tackle the Ebola virus epidemic, experts have revealed.
Two vaccines are being tested in the USA and some existing drugs have shown "great promise" in trials on laboratory monkeys, the World Health Organisation said.
Some of these drugs have already been tried on Ebola patients.
US sources said trials of one vaccine, involving monkeys, had already shown it could maintain immunity for at least ten months.
WHO set out developments in drug tests after a summit of experts in Geneva.
Researchers have also been developing blood-based treatments, including serums, together with monoclonal antibodies, RNA-based drugs and small antiviral molecules.
A WHO spokesman said: "Existing supplies of all experimental medicines are limited. While many efforts are under way to accelerate production, supplies will not be sufficient for several months to come.
"The prospects of having augmented supplies of vaccines rapidly look slightly better."
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