By Amanda L. Chan - amanda.chan@huffingtonpost.com

The worst outbreak of Ebola virus in history -- happening now in West Africa -- has claimed more than 700 lives, according to the latest count from the World Health Organization. The deaths occurred in Sierra Leone, Liberia, Guinea and Nigeria.

"This outbreak is moving faster than our efforts to control it," Margaret Chan, chief of the World Health Organization, said at a meeting, as reported by Reuters.

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