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. 2024 Feb 1;13(2):90. doi: 10.3390/biology13020090

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© 2024 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Phylogenetic relationships of SARS-CoV-2 clades. Covariants follow the Nextstrain Clade schema, where variants can descend from other variants. Starting from this figure, it is possible to show how the Omicron variant (21M clade, B.1.1.529) gave rise to a greater number of VOI/VOC. The tree has been generated from https://covariants.org (accessed on 29 January 2024). The red labels represent the date of first detection of each variant. As highlighted, XBB.1 showed a greater number of subvariants in a relatively short time.