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A health worker, wearing Personal Protective Equipment (PPE), and a woman pose on September 7, 2014 inside the high-risk area at Elwa hospital in Monrovia, which is run by the non-governmental  international 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)
A health worker, wearing Personal Protective Equipment (PPE), and a woman pose on September 7, 2014 inside the high-risk area at Elwa hospital in Monrovia, which is run by the non-governmental  international 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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    WHO declares West Africa Ebola-free

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WHO declares West Africa Ebola-free

The World Health Organization declared West Africa free of Ebola but said that Liberia, Guinea and Sierra Leone must remain vigilant. CNN's David McKenzie reports.

WHO declares West Africa Ebola-free

The World Health Organization declared West Africa free of Ebola but said that Liberia, Guinea and Sierra Leone must remain vigilant. CNN's David McKenzie reports.