Amid a new surge in coronavirus infections in the United States, the Government revealed that the Delta variant is spreading with "incredible efficiency," and now represents more than 83 percent of the virus circulating in the country.
"Compared to the virus we had circulating initially in the United States at the start of the pandemic, the Delta variant is more aggressive and much more transmissible than previously circulating strains," CDC director Dr. Rochelle Walensky said at a routine press briefing by White House COVID-19 Response Team.
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