Epidemiological characteristics of and containment measures for COVID-19 in Busan, Korea

손현진; 이효정; 이미영; 은영덕; Kyounghee Park; Seungjin Kim; Wonseo Park; Sora Kwon; Byoungseon Ahn; Dongkeun Kim; 김창훈

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저자정보: 손현진 (부산대학교) 이효정 (National Institute for Mathematical Sciences) 이미영 (Pusan National University Hospital) 은영덕 (부산대학교병원) Kyounghee Park (Pusan National University Hospital) Seungjin Kim (Pusan National University Hospital) Wonseo Park (Pusan National University Hospital) Sora Kwon (Pusan National University Hospital) Byoungseon Ahn (Busan Metropolitan City) Dongkeun Kim (Epidemic Investigation Team of Busan Metropolitan City) 김창훈 (부산대학교)

저널정보: 한국역학회 Epidemiology and Health Epidemiology and Health Vol.42

발행연도: 2020.1

수록면: 1 - 7 (7page)

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OBJECTIVES: To describe and evaluate epidemiological investigation results and containment measures implemented in Busan, where 108 cases were confirmed with coronavirus disease 2019 (COVID-19) between February 21, 2020 and March 24, 2020. METHODS: Any individual who tested positive for COVID-19 was classified as a confirmed case. Measures were taken to identify the source of infection and trace and quarantine contacts. Serial intervals were estimated and the effective reproduction number was computed. RESULTS: Of the total 18,303 COVID-19 tests performed between January 16, 2020 and March 24, 2020 in Busan, 108 yielded positive results (positive test rate, 0.6%). All confirmed cases were placed in isolation at hospitals. Of the 108 confirmed cases, 59 (54.6%) were female. The most common age group was 20-29 years with 37 cases (34.3%). Regarding symptoms at the time of diagnosis, cough (n=38, 35.2%) and fever (n=34, 31.5%) were most common; 12 cases (11.1%) were asymptomatic. The source of infection was identified in 99 cases (91.7%). A total of 3,223 contacts were identified and quarantined. Household contacts accounted for 196, and the household secondary attack rate was 8.2% (95% confidence interval [CI], 4.7 to 12.9). The mean serial interval was estimated to be 5.54 days (95% CI, 4.08 to 7.01). After February 26, (Rt) remained below 1 in Busan. CONCLUSIONS: The early containment strategy implemented in Busan shows that control is possible if outbreaks are of limited scope. In preparation for future outbreaks, public health and healthcare systems should be re-examined and put in a ready state.

#COVID-19 #Containment measure #Reproduction number #Korea

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