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KMID : 1143420220150060338
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Public Health Weekly Report
2022 Volume.15 No. 6 p.338 ~ p.343
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Importation and community transmission of SARS-CoV-2 B.1.1.529 (Omicron) variant of concern, the Republic of Korea, December 2021
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Lee Hye-Young
Lee Ji-Joo
Park Ha-Nul
Yu Mi
Kim Jong-Mu
Lee Sang-Eun
Park Young-Joon
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Abstract
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On December 1, 2021, SARS-CoV-2 B.1.1.529 (Omicron) variant of concern (VOC) was identified for the first time in the
Republic of Korea (ROK) and a total of 123 cases with Omicron VOC were identified through quarantine and community
epidemiological surveys. As of December 12, 2021, among them, a total number of cases (123), 90 cases were confirmed
through RT-PCR and NGS analysis and 33 epidemiological related cases were divided. By infection route, 23 imported cases and 100 additional cases of transmission in local communities were identified. In term of ages, sex, and vaccination status, 63.4% (78 cases) were between 20 and 59 years of age, 57.7% (71 cases) were female, which marked a slightly higher than male, and 54.5% (67 cases) were unvaccinated. Asymptomatic at diagnosis were 24.4% (30 cases), and the main symptoms of Omicron VOC were fever 32.5% (40 cases), sore throat 30.9% (38 cases), cough 29.3% (36 cases), headache 20.3% (25 cases). There were no cases exhibiting severe symptoms and no deaths up to now. The average incubation period was 4.2 days (2-8 days), and the serial interval was 2.8 to 3.4 days. As a result of the initial analysis of the epidemiological properties of the 123 cases of the omicron VOC, this report will share information with the public and related experts. This report recommended that the KDCA continuoue to monitor and respond to the omicron VOC.
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KEYWORD
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Coronavirus disease 2019, SARS-CoV-2, Omicron, Variant of Concern
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