Why the Mutated Coronavirus Variants Are So Worrisome

Viruses mutate all the time, including the novel coronavirus that’s caused the global Covid-19 pandemic. Most of the changes have no apparent effect. But recent variants that have emerged in the U.K., South Africa and Brazil are causing particular concern. They don’t appear to be any more virulent, but studies suggest they are more contagious than other strains. More people getting infected could lead to a surge in hospitalizations — as has happened in England and elsewhere — and potentially m

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