CDC ramps up research on highly contagious variant from India

Federal Health officials are ramping up their surveillance of the highly transmissible Covid-19 variant first identified in India as experts warn that under-vaccinated areas in the U.S. could become hot spots for the mutation.

While U.S. cases attributed to the B.1.617 variant currently sit below 1%, the growth rate remains unclear due to the small sample size. Meanwhile, one science group said the strain could be as much as 50% more transmissible than B.1.1.7, the variant that emerged from the U.K. That mutation was first seen in the U.S. in late December, and is now dominant nationally. A just-released U.K. study found the Pfizer Inc.-BioNTech SE vaccine was "highly effective” against a form of the B.1.617 variant two weeks after the second dose, affirming preliminary data from Phase 3 clinical trials. Still, the mutation has arrived in the U.S. at a time when anti-pandemic measures are loosening and around 60% of the population isn’t yet fully vaccinated.