The delta variant: Everything you need to know - NBC News
https://www.nbcnews.com/science/science-news/delta-delta-variants-everything-need-know-rcna1281
WebJul 2, 2021 · The delta variant, which was first identified in India, now accounts for 25 percent of new Covid-19 cases in the U.S., and is on track to become the dominant version of the virus circulating in...
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