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    U.N. rep 'cautiously optimistic' on Ebola

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U.N. rep 'cautiously optimistic' on Ebola

CNN's Richard Quest speaks to the U.N Under-Secretary-General Kandeh Yumkella about the Ebola epidemic in Sierra Leone.

U.N. rep 'cautiously optimistic' on Ebola

CNN's Richard Quest speaks to the U.N Under-Secretary-General Kandeh Yumkella about the Ebola epidemic in Sierra Leone.