My kids call me Debbie Downer for a reason. As a medical editor, I always worry about unexpected problems. An issue that’s really been bothering me lately is the rise in COVID-19 cases in the U.S. from several variants. Virologist and vaccinologist Paulo Verardi of the University of Connecticut explains why we’re in a tight race with the cagey coronavirus as we aim for herd immunity – and the virus aims to stop us.

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Lynne Anderson

Senior Health + Medicine Editor

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

Paulo Verardi, University of Connecticut

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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