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The Highly Contagious Delta Variant Is On The Rise In The U.S.

The Delta variant, or B.1.617.2, is now the dominant strain of SARS-CoV-2 in the U.K. and is causing surges of COVID-19 in parts of the country. (Mark Kerrison/Getty Images)
The Delta variant, or B.1.617.2, is now the dominant strain of SARS-CoV-2 in the U.K. and is causing surges of COVID-19 in parts of the country. (Mark Kerrison/Getty Images)

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