A descendant of the Delta variant of SARS-CoV-2, which is the virus that causes COVID-19, is spreading rapidly in England. This has led to concerns that the new variant, called AY.4.2, may be partly responsible for the high rate of infections in the United Kingdom. Based on what we know so far, however, the new variant is unlikely to be the main culprit.

smitted within a household than Alpha.

Over the past 28 days, the U.K. has recorded one of the highest absolute number of new cases in any country, second only to the United States.

The number of new daily cases per million pe

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