Disease

The World Health Organization is launching a $100 million response plan to combat an "unprecedented" outbreak of Ebola in West Africa that has killed 729 people out of 1,323 infected since February.

(CNN) -- A doctor who has played a key role in fighting the Ebola outbreak in Sierra Leone is infected with the disease, according to that country's Ministry of Health.

Dr. Sheik Humarr Khan is being treated by the French aid group Medicins Sans Frontieres -- also known as Doctors Without Borders -- in Kailahun, Sierra Leone, Tim Shenk, an agency spokesman, told CNN.

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The efforts to contain the largest Ebola outbreak in history have so far failed. International response teams, desperate to limit the toll of the fast-spreading epidemic in three West African countries, have been calling for the use experimental drugs or vaccines to try to stop the deadly virus. Many experts, however, including the scientist who led the work on a Canadian-made Ebola vaccine, say that using untested medications in the current West African outbreak could be disastrous. Other scientists disagree. The World Health Organization reports that the current outbreak, which is the first in West Africa, has so far infected 844 people, causing the death of 518 of them. This is double the size of the next largest outbreak, in Uganda in 2000, and this outbreak has just begun...

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