AI Article Synopsis
- A COVID-19 outbreak occurred in fitness centers in Cheonan, Korea, starting in February 2020, prompting an epidemiological investigation from February 24 to March 13.
- The outbreak involved 116 confirmed cases linked primarily to 8 Zumba instructors, with a notable attack rate of 7.3% among participants and their contacts.
- Effective measures such as contact tracing, isolation, and testing helped contain the outbreak, resulting in a significant decrease in the transmission rate shortly after the investigation began.
Article Abstract
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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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7416003 | PMC |
| http://dx.doi.org/10.3346/jkms.2020.35.e288 | DOI Listing |
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