An ongoing outbreak of the Ebola virus in Guinea, Sierra Leone and Liberia is the deadliest ever. The World Heath Organization says there have been 844 reported cases and 518 deaths as of July 8, 2014. Watch more animated explainers here: https://www.youtube.com/playlist?list=PLZd3QRtSy5LNTOjexx7-RZRAxT2p66HyZ

Watch – 5 Things To Know About Polio: https://www.youtube.com/watch?v=IhwRF7-Z9LE

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