The SARS-CoV-2 delta variant now makes up 83% of new U.S. cases, Dr. Rochelle Walensky, the director of the Centers for Disease Control and Prevention, said on Tuesday (July 20) at a Senate hearing.

“This is a dramatic increase up from 50% the week of July 3,” Walensky said. “In some parts of the country, the percentage is even higher, particularly in areas of low vaccination rates.”



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