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A COVID-19 patient in an ICU unit in a hospital in Capetown, South Africa, in December 2020. A variant emerged in South Africa that has since spread to other parts of the world. Other new variants could emerge elsewhere. Rodger Bosch/AFP via Getty Images

How worried should you be about coronavirus variants? A virologist explains his concerns

As the US vaccinates millions more people each day, the novel coronavirus works to survive. It does this by mutating. So far, several variants are worrisome. A virologist explains what they are.

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