Omicron sub-variant XBB.1.5 accounts for 61.3% of U.S. COVID cases - CDC
https://www.reuters.com/world/us/omicron-sub-variant-xbb15-accounts-613-us-covid-cases-cdc-2023-01-27/

Jan 27 (Reuters) - The Omicron subvariant XBB.1.5 has likely become the dominant variant in the United States, accounting for 61.3% of COVID cases in the week ended Jan. 28, data from the U.S. Centers for Disease Control and Prevention showed on Friday.

The subvariant accounted for 49.5% of cases in the week ended Jan. 21, estimates from CDC showed.

XBB.1.5, which is currently the most transmissible variant, is an offshoot of XBB, first detected in October.

The now-dominant XBB-related subvariants are derived from the BA.2 version of Omicron.

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What’s CH.1.1? Meet ‘Orthrus,’ a new wildcard Omicron strain with a concerning Delta mutation
https://fortune.com/well/2023/01/27/meet-orthus-ch11-new-omcrion-covid-variant-delta-mutation-deltacron-convergent-evolution/

^^Info about the dominant strain in the UK.