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. 2021 Feb 22;17:22. doi: 10.1186/s12992-021-00672-w

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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 — COVID-19 outbreak curve and timeline of implementation of major interventions in China. Note: ① Jan 20, 2020, classification of infectious diseases. ② On Jan 23, Wuhan lockdown. ③ On Jan 25, a leading group was established by the central government to respond to the COVID-19 outbreak. ④ On Jan 29, raising the public health emergency response to the highest level in all localities. ⑤ On Feb 2, classifying management of “four categories of personnel”. ⑥ On Feb 5, makeshift hospitals in operation. ⑦ On Feb 13, pairing assistance. ⑧ On Feb 19, launching massive community screening. ⑨ On April 8, lifted the lockdown of Wuhan city. ⑩ On April 29, China had entered into a phase of ongoing prevention and control