The delta subvariant recently identified in the U.K. is now twice as prevalent in England as it was two months ago, a government-backed study has found.
Published Thursday, an update to an ongoing study of Covid-19 in the U.K. found that the mutation — known as AY.4.2. — made up 12% of all new cases of the virus between Oct.19 and Nov. 5.
The study, which looked at swab samples from 100,000 people in England, was carried out by researchers at Imperial College London and Ipsos MORI, and was commissioned by the U.K.’s Department of Health and Social Care.
