Patrick Sawyer took a flight from Liberia on July 20 feeling fine, but by the time he arrived in the Nigerian capital Lagos, he had diarrhoea and vomiting and collapsed. Five days later he was dead.
More than 670 people have died and more than 1,200 people have been infected in the latest outbreak which started in south-eastern Guinea in February and has since spread to Sierra Leone and Liberia.
The idea that Ebola could spread further afield, including to the US or Europe, has put fear in the hearts of border controls around the world.
Liberian border crossings have been shut down and immigration controls have stepped up screening. But with symptoms taking days to appear, how can the spread of this epidemic be prevented? Keep reading
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