article_snippet: It is not clear how They became infected with Ebola, .
article_snippet: More than 10,000 people have died from Ebola - mainly in Sierra Leone, Liberia and Guinea - since December 2013, the World Health Organization says.
article_snippet: Outbreak: More than 10,000 people have died from Ebola, mainly in Sierra Leone, Liberia and Guinea, since December 2013, the World Health Organization  says.
article_snippet: Infected: This graph shows the number of healthcare workers to have been struck down by the deadly virus .
article_snippet: Mr Duncan later died from the deadly virus.
article_snippet: Ebola is spread through close contact with the bodily fluids of an infected person.
article_snippet: Ebola can cause lethal bleeding, muscle aches, severe vomiting and diarrhea.
article_snippet: the life-threatening disease typically takes hold two to 10 days after exposure, but the full inoculation period is considered to last 21 days.
highlights_snippet: Ebola disease has killed 10,000 people since December 2013, WHO says .