'Stealth' omicron variant BA.2 circulating in almost half of US, but CDC exercises caution: report

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Is BA.2 going to be omicron 2.0? 

There are now at least 127 known cases of the subvariant BA.2, otherwise known as the “stealth” variant, circulating in almost half of the United States that international experts suggest is more contagious as omicron, according to a recent CNBC report

But Kristen Nordlund, a CDC spokesperson, in a Monday statement to The Washington Post, cautions, “Currently, there are insufficient data to determine whether the BA.2 lineage is more transmissible or has a fitness advantage over the BA.1 lineage[omicron].”  

Cinematic Earth view from space at night with city lights and connections from big cities from Europe countries. 

“Although the BA.2 lineage has recently increased in proportion in some countries, it remains a very low proportion of circulating viruses in the United States and globally.” 

In Denmark where approximately 80% of Danes are fully vaccinated and 60% have received booster shots, BA.2 has displaced omicron as the predominant variant, with the health ministry reporting more than 50,000 new COVID-19 infections this Friday, likely mostly secondary to BA.2, Troels Lillebaek, the chairman of the country’s surveillance committee on COVID-19 variants, told CNBC

Lillebaek said the BA.2 variant has five unique mutations that are on a special part of the spike protein known to be associated with higher transmissibility, which Denmark’s Statens Serum Institut notes is 1.5 times as infectious as omicron, per CNBC

There are greater differences in mutations between BA.1 and BA.2 compared to the differences between the original “wild strain” and the alpha variant, which had the first major mutation to spread across the world, according to CNBC

The news outlet noted that the United Kingdom Health Security Agency (UKHSA) noted that BA.2 has a “substantial” growth advantage over omicron in England. 

“We now know that BA.2 has an increased growth rate, which can be seen in all regions in England,” said Dr. Susan Hopkins, chief medical advisor for the UKHSA

Aaron Salvador swabs his nose with a COVID-19 rapid antigen test kit outside the Watha T. Daniel-Shaw Neighborhood Library in Washington, D.C., on Wednesday December 29, 2021. 
( Tom Williams/CQ-Roll Call, Inc via Getty Images)

The agency noted there was no data on its severity compared to omicron, but preliminary assessment revealed no difference in vaccine effectiveness against symptomatic infection between the two subvariants

Although the World Health Organization has not classified BA.2 as a variant of concern, officials warned this past Tuesday not only new variants will arise as omicron continues to surge across the world, but also will be more transmissible than omicron

Tedros Adhanom Ghebreyesus, Director General of the World Health Organization (WHO), talks to the media at the World Health Organization headquarters in Geneva, Switzerland. (Jean-Christophe Bott/Keystone via AP)

“The next variant of concern will be more fit, and what we mean by that is it will be more transmissible because it will have to overtake what is currently circulating,” said Maria Van Kerkhove, the WHO’s Covid-19 technical lead

“The big question is whether or not future variants will be more or less severe.” 

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