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KMID : 0191120200350310288
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Journal of Korean Medical Science
2020 Volume.35 No. 31 p.288 ~ p.288
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Epidemiological Characteristics of COVID-19 Outbreak at Fitness Centers in Cheonan, Korea
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Bae Sang-Hyuk
Kim Hwa-Mi
Jung Tae-Young
Lim Ji-Ae
Jo Da-Hye
Kang Gi-Seok
Jeong Seung-Hee
Choi Dong-Kwon
Kim Hye-Jin
Cheon Young-Hee
Chun Min-Kyo
Kim Mi-Young
Choi Si-Won
Chun Chae-Min
Shin Seung-Hwan
Kim Hee-Kyoung
Park Young-Joon
Park Ok
Kwon Ho-Jang
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Abstract
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Background: In February 2020, a coronavirus disease 2019 (COVID-19) outbreak was reported in fitness centers in Cheonan, Korea.
Methods: From February 24 to March 13, an epidemiological investigation was conducted on the fitness center outbreak. All those who were screened were tested for severe acute respiratory syndrome coronavirus-2 (SARS CoV-2) using real-time reverse transcriptase polymerase chain reaction. Contacts were traced and self-isolated for 14 days. We determined the epidemiological characteristics of confirmed cases of SARS-CoV-2 infection, and estimated the time-dependent reproduction number to assess the transmission dynamics of the infection.
Results: A total of 116 cases were confirmed, and 1,687 contacts were traced. The source cases were 8 Zumba instructors who led aerobics classes in 10 fitness centers, and had the largest average number of contacts. A total of 57 Zumba class participants, 37 of their family members, and 14 other contacts were confirmed as cases. The attack rate was 7.3%. The contacts at Zumba classes and homes had a higher attack rate than other contacts. The mean serial interval (± standard deviation) were estimated to be 5.2 (± 3.8) days. The time-dependent reproduction number was estimated to be 6.1 at the beginning of the outbreak, but it dropped to less than 1, 2 days after the epidemiological investigation was launched.
Conclusion: The results suggest that the COVID-19 outbreak was effectively contained with rigorous contact tracing, isolating, and testing in combination with social distancing without a lock-down.
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KEYWORD
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Coronavirus, Disease Outbreak, Epidemiology, Basic Reproduction Number, Fitness Centers
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