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. 2022 Apr 24;10(5):678. doi: 10.3390/vaccines10050678

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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New COVID cases and vaccination rates in Bulgaria and Denmark, by weeks. Notes: Data by weeks, period 1 August to 31 October 2021. Left part of the figure shows data for Bulgaria. Source: Our World in Data; own calculations.