Delta variant surges to 83% of sequenced Covid-19 cases in the U.S., CDC says

The rapidly spreading Delta variant now accounts for 83% of sequenced Covid-19 cases in the United States, the nation’s public health leaders said Tuesday, and in parts of the country with low vaccination rates, it may be responsible for up to 90%.

Rochelle Walensky, the director of the Centers for Disease Control and Prevention, told a congressional hearing the new 83% estimate represents “a dramatic increase” from 50% of sequenced cases that were tallied the week of July 3. In some parts of the country that percentage is even higher, particularly in areas with low vaccination rates, said Anthony Fauci, head of the National Institute of Allergy and Infectious Diseases.

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