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Volume 28, Number 4—April 2022
Research Letter

Community Transmission of SARS-CoV-2 Omicron Variant, South Korea, 2021

Eun-Young Kim1, Young June Choe1, Hanul Park, Hyoseon Jeong, Jae-Hwa Chung, Jeonghee Yu, Hwa-Pyeong Ko, Hyun Jeong Ahn, Mi-Young Go, Ju-Hyung Lee, Won Ick Kim, Bu Sim Lee, Sooyeon Kim, Mi Yu, Jia Kim, Hye Ryeon Lee, Eun Jung Jang, Ji Joo Lee, Hye Young Lee, Jong Mu Kim, Ji Hyun Choi, Sang Eun Lee, Il-Hwan Kim, Ae Kyung Park, Jee Eun Rhee, Eun-Jin Kim, Sangwon Lee, and Young-Joon ParkComments to Author 
Author affiliations: Honam Regional Center for Disease Control and Prevention, Gwangju, South Korea (E.-Y. Kim, H. Jeong, J.-H. Chung, J. Yu); Korea University Anam Hospital, Seoul, South Korea (Y.J. Choe); Korea Disease Control and Prevention Agency, Cheongju, South Korea (H. Park, M. Yu, J. Kim, H.R. Lee, E.J. Jang, J.J. Lee, H.Y. Lee, J.M. Kim, J.H. Choi, S.E. Lee, I.-.H. Kim, A.K. Park, J.E. Rhee, E.-J. Kim, S. Lee, Y.-J. Park); Gwangju Metropolitan Government, Gwangju (H.-P. Ko); Jeollabuk-do Government, Jeonju, South Korea (H.J. Ahn, M.-Y. Go); Jeollabuk-do Center for Infectious Disease Control and Prevention, Jeonju, South Korea (J.-H. Lee); Jeollanam-do Government, Muan, South Korea (W.I. Kim, B.S. Lee); Jeollanam-do Communicable Disease Management Support Team, Muan (S. Kim)

Main Article


Epidemiologic characteristics of 182 severe acute respiratory syndrome coronavirus 2 Omicron variant cluster case-patients, South Korea, November 26–December 26, 2021

No. (%)
Age group, y
0–17 32 (17.6)
18–39 52 (28.6)
40–64 70 (38.5)
28 (15.4)
F 97 (53.3)
85 (46.7)
Transmission site*
Household 61 (33.7)
Sauna/karaoke 39 (21.5)
Restaurant 30 (16.6)
Kindergarten 19 (10.5)
Workplace 12 (6.6)
Church 8 (4.4)
Long-term care facility 7 (3.9)
Family gathering
5 (2.8)
Vaccination status
Unvaccinated 3 (20.9)
Partially vaccinated 3 (1.6)
Fully vaccinated
141 (77.5)
Asymptomatic 39 (21.4)
Critical illness 0
Death 0

*Excluding index case-patient. †As of January 3, 2022.

Main Article

1These authors contributed equally to this article.

Page created: February 12, 2022
Page updated: March 19, 2022
Page reviewed: March 19, 2022
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