The Delta variant of COVID-19, which originated in India, is the latest challenge the world is facing as key regions struggle to contain the coronavirus pandemic.
The strain is significantly more contagious than any other that’s appeared so far, scientists say. It has raised concerns over whether or not the vaccines currently available are effective enough to counter its spread.
Delta now accounts for roughly 30% of cases in the U.S., where 57.2% of adults are fully vaccinated and 66.2% have…
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