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.
“We’ve moved [Delta] to the top of our list of variants to study,” said Andrew Pekosz, a professor in Johns Hopkins University’s molecular microbiology and immunology department, and an expert in how viruses interact with the respiratory system.
“The data out of the UK showing how quickly the Delta variant became
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