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. 2021 Nov 25;11:22902. doi: 10.1038/s41598-021-02423-8

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© The Author(s) 2021

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/.

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Average number of non-travel related Campylobacter enteritis cases notified to the RKI according to the Protection against Infection Act (Infektionsschutzgesetz) (blue line; minimum and maximum shown in the light blue area) by date of disease onset in the time period 2013/2014–2019/2020. The red line shows the date of disease onset of participants of the case–control study (cases with date of disease onset from 25 December 2018 to 8 January 2019; controls with dates of disease onset earlier or later).