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Delta variant now makes up 83% of cases, CDC director says, pressed on booster shots
By Cheyenne Haslett
Vaccines are incredibly effective against Delta variant. So why do we need to wear masks indoors?
By Rong-Gong Lin II & Luke Money
Hospitalized Covid-19 patients are asking for the vaccine -- when it's too late, two health care workers say
By Jason Hanna
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