Humans have been fighting viruses throughout history. Here are the nine viruses that are the world's worst killers, based on their mortality rates, or the sheer numbers of people they have killed.
The rest of the story
livescience.com
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Humans have been fighting viruses throughout history. Here are the nine viruses that are the world's worst killers, based on their mortality rates, or the sheer numbers of people they have killed.
The rest of the story
livescience.com