Covid-19 cases have fallen far below the winter peak, but the Delta variant has roughly doubled every two weeks in the US

Scientists in the United States are anxiously watching the Delta variant of Covid-19, as it spreads through an unevenly vaccinated American public and an economy that is rapidly reopening.

The Delta variant, first identified as B.1.617.2 in India, is believed to be more transmissible than both the original strain of Covid-19 and the Alpha strain, first identified in the United Kingdom.

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Source: The Guardian