Trials of a possible Ebola vaccine could begin in West Africa in December with the vaccine more widely available in the first half of next year.
World Health Organisation (WHO) assistant director general Marie-Paule Kieny said: "Before the end of first half of 2015...we could have available a few hundred thousand doses. That could be 200,000 - it could be less or could be more."
She was speaking after WHO held talks about potential vaccines with health experts, officials from Ebola-affected nations and pharmaceutical firms.
There is currently no proven vaccine against the deadly virus and drug companies have previously avoided investing too heavily in a cure because outbreaks before this year's had been small.
West Africa's Ebola outbreak began in March and has killed more than 4,900 people, most of them in Liberia, Sierra Leone and Guinea, according to the WHO.
It believes that up to 1.4 million people could have been affected by 2015 and there are also fears the virus may be used as a weapon of bio-terrorism.
Two leading vaccine contenders are already in trials, with another five to begin trials next year.
US firm Johnson & Johnson have already said they aim to produce at least one million doses of their vaccine next year and UK-based GlaxoSmithKiline is also working on a vaccine called ChAd3.
GSK's chief executive Sir Andrew Witty said earlier that this week's meeting of health experts should discuss ways to make sure all drug companies worked together to get the vaccine out.
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