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. 2019 Jul 18;9:10434. doi: 10.1038/s41598-019-46898-y

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© The Author(s) 2019

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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Cross-correlation between H7N9 cases with BSI and WPI for searching and posting the H7N9, Avian influenza and Live poultry. Note: Blue bars indicate the value of BSI data from 2013–2017. The value of WPI data is displayed by red bars. Confidence intervals (95%) are indicated by the black line (X axis: lag value; Y axis: CCF value, defined as the set of sample correlations; highest value of lag and CCF are marked in each panel).