First identified in India in December 2020, Delta swept rapidly through that country and Great Britain before reaching the U.S., where it quickly surged. Then, the Delta variant surfaced in the United States. Even as people began to feel some hope-or at least cautious optimism-early this summer that the pandemic could recede to the background, there was still the threat that new mutations of the COVID-19 virus could bring it back, and it might be even stronger.
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