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. 2020 Dec 1;10(1):28. doi: 10.1186/s13362-020-00096-y

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© The Author(s) 2020

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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Cumulative incidence according to age class. Cumulative incidence according to age class (circles) and best fitting transmission model (line), with 95% confidence interval (gray region). The red circles represent data from February 26 to May 16 (fitted). The blue circles represent data May 17 to June 1 (not fitted). Cumulative incidence shown for (A) ages 0–5, (B) ages 6–13, (C) ages 14–17, (D) ages 18–24, (E) ages 25–64 and (F) ages 65+. For an explanation of the increase in reported cases after May 16, see Appendix B: Caution in interpretation