Here's a look at Ebola and the unprecedented challenges health workers face in trying to contain what the World Health Organization chief has called one of the world's most dangerous diseases in one of the world's most dangerous regions.

The WHO says the deadly Ebola virus outbreak in Congo is now an international health emergency. More than 1,600 people have died since August in the second-worst outbreak of the disease in history. Wednesday's declaration was sparked by confirmation of a case in Goma, a Congo city of more than two million people on the border with Rwanda.

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