2021 Nov.26 CDC Statement on B.1.1.529 (Omicron variant) krc4Uncategorized On November 26, 2021, the World Health Organization (WHO) classified a new variant, B.1.1.529, as a Variant of Concern and has named it Omicron. Share this: Share on Facebook (Opens in new window) Facebook Share on X (Opens in new window) X