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. 2023 Sep 27;23:632. doi: 10.1186/s12879-023-08594-1

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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 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 — Variations observed pre- and post-implementation of NPI in cities located in North and South China. The graph displays the seasonality of the weekly percentage of patients with influenza-like illness (ILI%) in China during 2 periods: 2018 to 2019 (pre-NPIs) and 2020 to 2023 (post-NPIs). The red and light pink lines correspond to southern cities in China, while the blue and sky-blue lines correspond to northern cities. The shaded areas indicate the maximum and minimum values