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Volume 26, Number 10—October 2020

Contact Tracing during Coronavirus Disease Outbreak, South Korea, 2020

Young Joon Park1, Young June Choe1, Ok Park, Shin Young Park, Young-Man Kim, Jieun Kim, Sanghui Kweon, Yeonhee Woo, Jin Gwack, Seong Sun Kim, Jin Lee, Junghee Hyun, Boyeong Ryu, Yoon Suk Jang, Hwami Kim, Seung Hwan Shin, Seonju Yi, Sangeun Lee, Hee Kyoung Kim, Hyeyoung Lee, Yeowon Jin, Eunmi Park, Seung Woo Choi, Miyoung Kim, Jeongsuk Song, Si Won Choi, Dongwook Kim, Byoung-Hak Jeon, Hyosoon Yoo, Eun Kyeong JeongComments to Author , on behalf of the COVID-19 National Emergency Response Center, Epidemiology and Case Management Team
Author affiliations: Korea Centers for Disease Control and Prevention, Cheongju, South Korea (Y.J. Park, O. Park, S.Y. Park, Y.-M. Kim, J. Kim, S. Kweon, Y. Woo, J. Gwack, S.S. Kim, J. Lee, J. Hyun, B. Ryu, Y.S. Jang, H. Kim, S.H. Shin, S. Yi, S. Lee, H.K. Kim, H. Lee, Y. Jin, E. Park, S.W. Choi, M. Kim, J. Song, S.W. Choi, D. Kim, B.-H. Jeon, H. Yoo, E.K. Jeong); Hallym University College of Medicine, Chuncheon, South Korea (Y.J. Choe)

Main Article

Table 2

Rates of coronavirus disease among household and nonhousehold contacts, South Korea, January 20–March 27, 2020

Index patient age, y

No. contacts positive/no. contacts traced
% Positive (95% CI)
No. contact positive/no. contacts traced
% Positive (95% CI)
0–9 3/57 5.3 (1.3–13.7) 2/180 1.1 (0.2–3.6)
10–19 43/231 18.6 (14.0–24.0) 2/226 0.9 (0.1–2.9)
20–29 240/3,417 7.0 (6.2–7.9) 138/12,393 1.1 (0.9–1.3)
30–39 143/1,229 11.6 (9.9–13.5) 70/7,407 0.9 (0.7–1.2)
40–49 206/1,749 11.8 (10.3–13.4) 161/7,960 2.0 (1.7–2.3)
50–59 300/2,045 14.7 (13.2–16.3) 166/9,308 1.8 (1.5–2.1)
60–69 177/1,039 17.0 (14.8–19.4) 215/7,451 2.9 (2.5–3.3)
70–79 86/477 18.0 (14.8–21.7) 92/1,912 4.8 (3.9–5.8)
14.4 (11.0–18.4)

4.6 (3.6–5.7)
Total 1,248/10,592 11.8 (11.2–12.4) 921/48,481 1.9 (1.8–2.0)

Main Article

1These authors contributed equally to this article.

Page created: June 30, 2020
Page updated: July 16, 2020
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