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Half of New U.S. Covid Cases Now Tied to Delta Variant, CDC Says

July 7, 2021, 1:34 PM

The delta variant is set to become the predominant Covid strain in the U.S., boosting concerns it could lead to a surge in cases in under-vaccinated hot spots.

The highly transmissible variant made up 30% of positive samples sequenced in the U.S. for the two-week period ending June 19. The variant is predicted to increase to 52% in the two weeks ending July 3, according to Jade Fulce, a spokesperson at the U.S. Centers for Disease Control and Prevention.

In June, the agency classified the B.1.617.2 strain, first identified in India, as a variant of concern. On July 1, ...

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