New study on delta variant reveals importance of receiving both vaccine shots, highlights challenges posed by mutations

The emergence of the delta variant is neither entirely surprising — virologists have warned that SARS-CoV-2 will continue to mutate — nor welcome, coming as many nations that have been mired in pandemic mode for a year and a half are trying to return to normal activity. England, for example, plans to lift all restrictions by July 19 despite a surge in delta infections, which accounts for an estimated 95 percent of new cases. Britain’s health secretary, Sajid Javid, told BBC Radio that coronavirus cases could reach 100,000 a day this summer.

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