A mobile Covid-19 vaccination centre outside Bolton Town Hall, Bolton, where case numbers of the Delta variant first identified in India have been relatively high.

Peter Byrne | PA Images | Getty Images

The delta variant first identified in India is now estimated to make up 83% of all sequenced Covid-19 cases in the U.S., the director of the Centers for Disease Control and Prevention said Tuesday.

“This is a dramatic increase from from up from 50%, the week of July 3,” CDC Director Dr. Rochelle Walensky said during a Senate hearing.

This is breaking news. Please check back for updates.



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