WHO Statement on Omicron sublineage BA.222 Feb 2022 22:47
From WHO today…
As part of its on-going work to track variants, WHO's Technical Advisory Group on SARS-CoV-2 Virus Evolution (TAG-VE) met yesterday to discuss the latest evidence on the Omicron variant of concern, including its sublineages BA.1 and BA.2….
While reaching the above determination, the TAG-VE also looked at preliminary laboratory data from Japan generated using animal models without any immunity to SARS-CoV-2 which highlighted that BA.2 may cause more severe disease in hamsters compared to BA.1. They also considered real-world data on clinical severity from South Africa, the United Kingdom, and Denmark, where immunity from vaccination or natural infection is high: in this data, there was no reported difference in severity between BA.2 and BA.1.
WHO will continue to closely monitor the BA.2 lineage as part of Omicron and requests countries to continue to be vigilant, to monitor and report sequences, as well as to conduct independent and comparative analyses of the different Omicron sublineages.
The TAG-VE meets regularly and continues to discuss available data on transmissibility and severity of variants, and their impact on diagnostics, therapeutics, and vaccines.