Fourth USA aid worker with Ebola in Atlanta

What is Ebola: There is an ongoing outbreak of the Ebola virus in Guinea in west Africa. Medical experts are concerned about it appearing in a densely populated area – the capital city of Conakry – and into neighbouring countries. Ebola is one of the most virulent diseases known to man and can kill up to 90% of the people it infects in a very short time period. But what causes it? How does it spread from human to human? And why is it unlikely to spread across continental borders? Wacth here.

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