It’s been only nine months since the world learned of a new coronavirus that would trigger a pandemic declaration in March and ultimately disrupt billions of lives.
That’s little more than a blink of the eye when it comes to understanding a novel disease, and the advice from scientists and doctors is still evolving as they accumulate experience with COVID-19.
Here are some things that science has learned — so far — about the SARS-CoV-2 coronavirus and the disease it causes.
Virus by the numbers
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