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WHO says delta Covid variant has now spread to 80 countries, and it keeps mutating


A mobile Covid-19 vaccination centre outside Bolton Town Hall, Bolton, where case numbers of the Delta variant first identified in India have been relatively high.

Peter Byrne | PA Images | Getty Images

The delta Covid variant first detected in India has now spread to more than 80 countries, and it continues to mutate as it spreads across the globe, World Health Organization officials said Wednesday.

The variant now makes up 10% of all new cases in the United States, up from 6% last week. Studies have shown the variant is even more transmissible than other variants. WHO officials said some reports have found that it also causes more severe symptoms, but more research is needed to confirm those conclusions.

The WHO is also tracking recent reports of a “delta plus” variant, “what I think this means is that there is an additional mutation that has been identified,” Maria Van Kerkhove, WHO’s Covid-19 technical lead said. “In some of the delta variants we’ve seen one less mutation or one deletion instead of an additional, so we’re looking at all of it.”

The United Kingdom recently saw the delta variant become the dominate strain there, surpassing its native alpha variant, which was first detected in the country last fall. The delta variant now makes up more than 60% of new cases in the U.K.

Dr. Anthony Fauci, chief medical advisor to the president said last week that “we cannot let that happen in the United States,” as he pushed to get more people vaccinated, especially young adults.

The Centers for Disease Control and Prevention designated the delta variant as a variant of concern in the U.S. on Tuesday. The WHO designated the delta variant as a variant of concern in early May.

The WHO has also added another Covid mutation on Tuesday to its list of variants of interest, the lambda variant. The agency is monitoring more than 50 different Covid variants, but not all become enough of a public health threat to make the WHO’s formal watchlist. The lambda variant has multiple mutations in the spike protein that could have an impact on its transmissibility, but more studies are needed to fully understand the mutations, Van Kerkhove said.

The lambda variant has been detected by scientists in South American, including in Chile, Peru, Ecuador and Argentina, thanks to increased genomic surveillance.

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