24.11.21 | New lineages

Newly designated recombinant lineage XB

The latest release of the pangoLEARN model (2021-11-18, trained on pango-designation v1.2.97) includes the new recombinant lineage XB, described in this preprint.

XB was previously designated B.1.628 but its label has been updated to reflect its recombinant history, as specified under the Pango nomenclature for recombinant lineages. Sequences previously designated B.1.628 are now designated XB and the label B.1.628 has been withdrawn.

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