COVID-19’s delta variant: What you need to know
Last updated July 30, 2021
Since the COVID-19 pandemic began, several variants of the virus have emerged. But the one named delta is now the most severe of them all. This highly contagious variant was first identified in India in December 2020. Within six months, it spread to 85 countries. Now it's in all 50 of the United States, where it's become the dominant strain of COVID-19.
Infectious disease expert David...
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