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. 2021 Oct 15;10:124. doi: 10.1186/s40249-021-00909-1

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© The Author(s) 2021

Open AccessThis 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 — The size of the target population for the COVID-19 vaccination program, stratified by provincial-level administrative division. A Overall population. B The target population size for maintaining the essential functions of society, including healthcare workers and other critical workers. C The target population size for protecting the high-risk population, including people with underlying conditions and older adults. D The target population size for containing SARS-CoV-2 transmission, including working-age people, school-aged children and younger children