• J. Korean Med. Sci. · Dec 2020

    The Serial Interval of COVID-19 in Korea: 1,567 Pairs of Symptomatic Cases from Contact Tracing.

    • Kwan Hong, Sujin Yum, Jeehyun Kim, and Byung Chul Chun.
    • Department of Preventive Medicine, Korea University College of Medicine, Seoul, Korea.
    • J. Korean Med. Sci. 2020 Dec 28; 35 (50): e435.

    AbstractAlthough coronavirus disease 2019 (COVID-19) is an ongoing pandemic, the mean serial interval was measured differently across nations. Through the Korean national COVID-19 contact tracing system, we were able to investigate personal contacts in all symptomatic cases in Korea from January 20 to August 3, 2020. The mean serial interval was calculated by the duration between the symptom onset of the infector and infectee, and became shorter after the case definition changed to include not-imported cases in Korea on February 20, 2020. The mean serial interval before and after this fifth case definition was 6.12 and 3.93 days based on the infectors' symptom onset date, respectively, and 4.02 days in total with the median of 3 days. Older age and women lead to longer serial intervals.© 2020 The Korean Academy of Medical Sciences.

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