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. 2022 Jan 3;44:e2022006. doi: 10.4178/epih.e2022006

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©2022, Korean Society of Epidemiology

This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 1. — The smoothed daily numbers of new confirmed cases (red) and tests (blue) from January 1 to March 27, 2021. The vertical dashed line separates the periods before and after vaccination programs were launched. No test data exist for China, Egypt, and Tanzania. Brazil, Vietnam, and Democratic Republic of Congo do not have complete data about tests.