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Volume 28, Number 4—April 2022
Research Letter

Time from Exposure to Diagnosis among Quarantined Close Contacts of SARS-CoV-2 Omicron Variant Index Case-Patients, South Korea

Hye Ryeon Lee1, Young June Choe1, Eun Jung Jang, Jia Kim, Ji Joo Lee, Hye Young Lee, Hanul Park, Sang Eun Lee, Moonsu Kim, Seonggon Kim, Hanna Yoo, Ju-Hyung Lee, Hyun Jeong Ahn, Mi-Young Go, Won Ick Kim, Bu Sim Lee, Hwa-Pyeong Ko, Jeonghee Yu, Eun-Young Kim, Hyoseon Jeong, Jae-Hwa Chung, Jin Su Song, Jihee Lee, Mi Young Kim, and Young-Joon ParkComments to Author 
Author affiliations: Korea Disease Control and Prevention Agency, Cheongju, South Korea (H.R. Lee, E.J. Jang, J. Kim, J.J. Lee, H.Y. Lee, H. Park, S.E. Lee, Y.-J. Park); Korea University Anam Hospital, Seoul, South Korea (Y.J. Choe); Incheon Metropolitan City, Incheon, South Korea (M. Kim, S. Kim, H. Yoo); Jeollabuk-do Center for Infectious Disease Control and Prevention, Jeonju, South Korea (J.-H. Lee); Jeollabuk-do Government, Jeonju (H.J. Ahn, M.-Y. Go); Jeollanam-do Government, Muan, South Korea (W.I. Kim, B.S. Lee); Gwangju Metropolitan Government, Gwangju, South Korea (H.-P. Ko); Honam Reginal Center for Disease Control and Prevention, Gwangju (J. Yu, E.-Y. Kim, H. Jeong, J.-H. Chung); Capital Regional Center for Disease Control and Prevention, Seoul (J.S. Song, J. Lee, M.Y. Kim)

Main Article


Time from close contact exposure to index case-patients infected with severe acute respiratory syndrome coronavirus 2 Omicron variant of concern to diagnosis of infection, South Korea*

Variable Close contacts, no. (%) Time from exposure to diagnosis, d
Average (± SD) Median IQR (range)
All close contacts 107 3.7 (± 2.6) 3.0 (2–5)
Age group, y
<20 37 (34.6) 4.4 ± (3.0) 4.0 (3–6)
20–59 64 (59.8) 3.3 (± 2.5) 3.0 (1–5)
6 (5.6)
3.7 (± 2.0)
4.0 (1.8–5.3)
F 56 (52.3) 3.5 (± 2.5) 3.0 (1.3–5)
51 (47.7)
4.0 (± 2.8)
3.0 (2–5)
Symptom status
Symptomatic 85 (79.4) 3.3 (± 2.1) 3.0 (2–5)
22 (20.6)
5.2 (± 3.8)
5.0 (2–9)
Vaccination status
Not vaccinated 58 (54.7) 4.0 (±2.7) 3.0 (2–5)
Partially vaccinated 6 (5.7) 3.0 (± 2.1) 2.5 (1–5.3)
Fully vaccinated 42 (39.6) 3.4 (± 2.7) 3.0 (1–5)

*IQR, interquartile range.

Main Article

1These authors contributed equally to this article.

Page created: February 06, 2022
Page updated: March 19, 2022
Page reviewed: March 19, 2022
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