Sources of Infection Among Confirmed Cases of COVID-19 in Jeju Province, Korea.

J Prev Med Public Health · 2021 · PMC8357538 · PMID 34370937

Europe PMC DOI

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an increasing trendno p-value reported

The reason for this is that the nationwide proportion of unknown sources in the first, second, and third waves was 9.3%, 14.9%, and 22.6%, respectively, showing an increasing trend [ 4 ].

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