The highly transmissible Omicron variant of the SARS-CoV-2 virus - the most common form of which is known as BA.1 - now accounts for nearly all of the coronavirus infections globally, although dramatic surges in COVID cases have already peaked in some countries.
Scientists are now tracking a rise in cases caused by a close cousin known as BA.2, which is starting to outcompete BA.1 in parts of Europe and Asia. The following is what we know so far about the new subvariant:Globally, BA.1 accounted for 98.8% of sequenced cases submitted to the public virus tracking database GISAID as of Jan. 25. But several countries are reporting recent increases in the subvariant known as BA.2, according to the World Health Organization.
Trevor Bedford, a computational virologist at Fred Hutchinson Cancer Center who has been tracking the evolution of SARS-CoV-2, wrote on Twitter on Friday that BA.2 represents roughly 82% of cases in Denmark, 9% in the UK and 8% in the United States, based on his analysis of sequencing data from the GISAID database and case counts from the Our World in Data project at the University of Oxford.
BA.2, sometimes known as a "stealth" subvariant, does not have the same missing target gene. Instead, scientists are monitoring it the same way they have prior variants, including Delta, by tracking the number of virus genomes submitted to public databases such as GISAID. Danish health officials estimate that BA.2 may be 1.5 times more transmissible than BA.1, based on preliminary data, though it likely does not cause more severe disease.In England, a preliminary analysis of contact tracing from Dec. 27, 2021, through Jan. 11, 2022, by the UK Health Security Agency suggests that household transmission is higher among contacts of people infected with BA.2 compared with other Omicron cases .A critical question is whether people who were infected in the BA.
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