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Serum made from the blood of recovered Ebola patients could be available within weeks in Liberia, one of the countries worst hit by the virus, says the World Health Organization, the BBC reported.

Speaking in Geneva, Dr Marie Paule Kieny said work was also advancing quickly to get drugs and a vaccine ready for January 2015.

The Ebola outbreak has already killed more than 4,500 people.

Most of the deaths have been in Guinea, Liberia and Sierra Leone.

Dr Kieny, WHO assistant director general for health system and innovation, said: "There are partnerships which are starting to be put in place to have capacity in the three countries to safely extract plasma and make preparation that can be used for the treatment of infective patients.

"The partnership which is moving the quickest will be in Liberia where we hope that in the coming weeks there will be facilities set up to collect the blood, treat the blood and be able to process it for use."

It is still unclear how much will become available and whether it could meet demand.