The first large-scale trials of two experimental vaccines against Ebola have begun in Liberia.
The potentially preventative medicines were taken under strict security to a secret location in the West African country.
Scientists aim to immunise 30,000 volunteers, including front-line health workers.More than 8,500 people have died in the Ebola outbreak, the vast majority in Guinea, Liberia and Sierra Leone.
The total number of reported cases is more than 22,000. In Liberia alone, more than 3,600 people have died from the disease.
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