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. 2023 May 22;3(6):722–733. doi: 10.1038/s43587-023-00421-1

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© The Author(s) 2023

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Extended Data Fig. 1 — We report the evolution through time of Ct values measured in both infected residents (a) and aerosols analyzed in the lounge of the nursing home (b). Grey dots refer to negative PCR results. In addition, we also report the time-scaled phylogenetic analysis involving Gamma (P.1) genomes sampled and sequenced from this outbreak (c), showing one phylogenetic cluster (zoomed in the red circle, scale bar corresponds to the full tree) among 6 full genomes (orange dots), likely corresponding to a single introduction event into nursing home B. The phylogenetic tree is time-calibrated, meaning that branch lengths are in units of time (year).