The delta Covid mutation is spreading in the UK, but may be less likely to cause symptoms


Cover picture for the articleLONDON — 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...

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