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. 2021 Jan 31;18(3):1265. doi: 10.3390/ijerph18031265

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© 2021 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 (http://creativecommons.org/licenses/by/4.0/).

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COVID-19 epidemic curve and chain of contagion in a sample of patients in the Republic of Korea. 20 January–10 February 2020. (A) An epidemic curve over the confirmed dates. The confirmed cases were grouped as imported cases (blue), primary (red), and secondary (green) infections. Note that the imported cases are the patients who were already infected. (B) A chain of COVID-19 infection by confirmation date in Korea from 20 January to 10 February 2020. The imported cases (blue) are annotated with the country of importation. Solid arrows and dashed arrows represent transmission relationships that are between family members and friends, respectively.