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The Worst Viruses in History

Lassa

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First discovered in Africa, the Lassa virus is transmitted through respiration near mouse droppings. It starts off with a high fever, then quickly turns into chest pain, encephalitis, facial swelling and deafness.

With a mortality rate of approximately 20 percent, it’s easy to see why people get nervous when they hear of a Lassa outbreak. Even if you survive, there’s no guarantee that you’ll ever have your hearing come back.


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