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The deadliest viruses in history

Humans have been fighting viruses since the species has existed. For some viral diseases, vaccines and antiviral drugs have prevented widespread infection or helped people recover. And we’ve even been able to eradicate one disease — smallpox. 

Some viruses pose a bigger threat than others. The viral strain that drove the 2014-2016 Ebola outbreak in West Africa kills up to 90% of the people it infects, making it the most lethal member of the Ebola family.

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