of COVID-19 for the Shincheonji Church cluster was estimated to be 8.5 [95% credible interval (CrI): 6.3, 10.9].
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for the Shincheonji Church cluster is more than 4 times larger than the general population ( = 1.9 [95% CrI: 0.4, 4.4]).
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Estimated 4 [95% CrI: 2, 11] undetected cases already existed when the index case reported symptoms on February 7.
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The Shincheonji Church cluster is likely to be emblematic of other outbreak-prone populations.
Abstract
Rapid transmission of coronavirus disease 2019 (COVID-19) was observed in the Shincheonji Church of Jesus, a religious sect in South Korea. The index case was confirmed on February 18, 2020 in Daegu City, and within two weeks, 3081 connected cases were identified. Doubling times during these initial stages (i.e., February 18 – March 2) of the outbreak were less than 2 days. A stochastic model fitted to the time series of confirmed cases suggests that the basic reproduction number () of COVID-19 was 8.5 [95% credible interval (CrI): 6.3, 10.9] among the church members, whereas ( = 1.9 [95% CrI: 0.4, 4.4]) in the rest of the population of Daegu City. The model also suggests that there were already 4 [95% CrI: 2, 11] undetected cases of COVID-19 on February 7 when the index case reportedly presented symptoms. The Shincheonji Church cluster is likely to be emblematic of other outbreak-prone populations where of COVID-19 is higher. Understanding and subsequently limiting the risk of transmission in such high-risk places is key to effective control.