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. 2024 Jan 15;24:181. doi: 10.1186/s12889-024-17695-8

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© The Author(s) 2024

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 1 — Distribution of primary and secondary COVID-19 infections in Norway from February 2020–January 2022, using a minimum interval of 60 days between re-infections, or having two results of different variant. A Number of COVID-19 reported cases and cases with known variant by week of sampling. The proportion of Alpha, Delta and Omicron cases presented on the secondary axis. B Number of reported COVID-19 cases and reinfections by week of sampling. The proportion of reinfections out of reported cases are presented on the secondary axis