The B.1.617.2 strain, officially known as the Delta variant, is worrying health officials across the world, including in the United States. The Delta variant now accounts for more than 6% of sequenced virus samples in the US, according to data from the US Centers for Disease Control and Prevention. While that might seem a relatively small share, the speed of its growth is worrying. A month ago, the strain accounted for just over 1% of sequenced virus samples, according to the CDC data.Experts believe the Delta variant sparked the huge wave in infections seen across India over the past two months. It is now causing concern in the United Kingdom, where it now comprises 91% of new cases, according to Health Secretary Matt Hancock. The

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