The deadly Ebola outbreak, which started in Guinea, has now spread to Sierra Leone, Liberia and Nigeria claiming 670 lives so far.

Two American medical workers have been infected after treating patients with the disease in Liberia.

Whilst countries affected have closed their land borders, international flights continue to fly in and out of countries and so far the World Health Organisation has not recommended any travel restrictions.

Said to be one of the most virulent viral diseases known to humankind, the virus causes death in 50 to 90 per cent of all clinically ill cases.

Watch this 60 second video to find out the key facts.

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