The Delta variant offshoot, found in dozens of countries, could be more transmissible than other Delta mutants.
AY.4.2, an offshoot of the Delta AY.4 variant, currently accounts for between 11 and 12 percent of recent U.K. COVID samples and 21,848 cases had been reported there overall on Monday morning EDT.
It comes after AY.4.2 was recently declared to be a Variant Under Investigation on October 21 by the U.K. Health Security Agency, which had been assessing the variant's spread. Meanwhile AY.4.2 has been detected in a total of 39 countries around the world, according to Outbreak.Info, including Canada, Australia, Japan, and much of Europe. Romania has the highest proportion of AY.4.2 cases behind the U.K.
In the U.S., Centers for Disease Control and Prevention director Rochelle Walensky acknowledged AY.4.2's presence in the country in a press briefing last week. She added:"At this time, there is no evidence that the sub-lineage AY 4.2 impacts the effectiveness of our current vaccines or therapeutics, and we will continue to follow up."
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