The World Health Organization warned Thursday that Africa faced a "complex" Ebola outbreak after the virus crossed from east Africa to Nigeria, marking the first case in the west of the continent.
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The World Health Organization warned Thursday that Africa faced a "complex" Ebola outbreak after the virus crossed from east Africa to Nigeria, marking the first case in the west of the continent.

The World Health Organization warned Thursday that Africa faced a "complex" Ebola outbreak after the virus crossed from east Africa to Nigeria, marking the first case in the west of the continent.