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. 2022 Oct 28;5:161. doi: 10.1038/s41746-022-00704-8

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© The Author(s) 2022

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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Fig. 9 — The relationship between the retrieval data and the occurrence and development of cryptic transmission is shown. a Shows national data, and b shows a ratio (regional/national data) that expresses the concept of “relativity”. The left vertical axis represents the confirmed data and Baidu search index (after standardized processing), and the right vertical axis represents whether hidden transmission occurs (0 represents no occurrence and 1 represents occurrence). Regional Internet retrieval data are easily affected by the overall level of the country and Internet media information, so the proportion of regions in the country is used to construct the dataset.