Why the Mutated Coronavirus Variants Are So Worrisome: QuickTake

Viruses mutate all the time, including the coronavirus that’s caused the global Covid-19 pandemic. Although most of the changes are innocuous, several mutants have sparked alarm, and three variants that emerged in the U.K., South Africa and Brazil have caused particular concern as they spread worldwide. Studies suggest they are more contagious, and some evidence points to one of them being more deadly and another driving reinfections. Vaccine developers are working on new versions after early da

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