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 health worker stands on September 7, 2014 at Elwa hospital in Monrovia, which is run by the non-governmental French organization Medecins Sans Frontieres (Doctors without Borders -- MSF). US President Barack Obama said in an interview aired on September 7 the US military would help in the fight against fast-spreading Ebola in Africa, but warned it would be months before the epidemic slowed. The tropical virus, transmitted through contact with infected bodily fluids, has killed 2,100 people in four countries since the start of the year -- more than half of them in Liberia.   AFP PHOTO / DOMINIQUE FAGET        (Photo credit should read DOMINIQUE FAGET/AFP/Getty Images)
 health worker stands on September 7, 2014 at Elwa hospital in Monrovia, which is run by the non-governmental French organization Medecins Sans Frontieres (Doctors without Borders -- MSF). US President Barack Obama said in an interview aired on September 7 the US military would help in the fight against fast-spreading Ebola in Africa, but warned it would be months before the epidemic slowed. The tropical virus, transmitted through contact with infected bodily fluids, has killed 2,100 people in four countries since the start of the year -- more than half of them in Liberia.   AFP PHOTO / DOMINIQUE FAGET        (Photo credit should read DOMINIQUE FAGET/AFP/Getty Images)

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    W.H.O.: Ebola epidemic is out of control

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W.H.O.: Ebola epidemic is out of control

The World Health Organization says there could be as many as 20,000 Ebola cases before it's brought under control.

W.H.O.: Ebola epidemic is out of control

The World Health Organization says there could be as many as 20,000 Ebola cases before it's brought under control.