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Vaccines are incredibly effective against Delta variant. So why do we need to wear masks indoors?
By Rong-Gong Lin II & Luke Money
The Delta Variant Upends the World's Pandemic Response
By Jason Douglas & Gabriele Steinhauser
The Delta variant is driving up COVID rates. See the states where it's most prevalent
By Nicolas Rapp & Erika Fry
COVID cases are up 55% across the U.S.
By Sam Baker