We’ve never seen a virus evolve like this. Here’s why COVID’s future is still a mystery

We’ve never seen a virus evolve like this. Here’s why COVID’s future is still a mystery

When scientists find a new disease-causing virus in humans, the first question they want answered is: Can this thing spread easily from person to person? And if not, will it someday? Avian influenza can infect humans, but it’s not very good at passing from one person to another. Same with the coronavirus that causes MERS, …

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