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Seonju Yi 3 Articles
Presumed population immunity to SARS-CoV-2 in South Korea, April 2022
Eun Jung Jang, Young June Choe, Seung Ah Choe, Yoo-Yeon Kim, Ryu Kyung Kim, Jia Kim, Do Sang Lim, Ju Hee Lee, Seonju Yi, Sangwon Lee, Young-Joon Park
Osong Public Health Res Perspect. 2022;13(5):377-381.   Published online October 14, 2022
DOI: https://doi.org/10.24171/j.phrp.2022.0209
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Graphical AbstractGraphical Abstract AbstractAbstract PDF
Objectives
We estimated the overall and age-specific percentages of the Korean population with presumed immunity against severe acute respiratory syndrome coronavirus 2 (SARSCoV-2) as of April 2022 using the national registry.
Methods
We used the national coronavirus disease 2019 (COVID-19) infection and vaccination registry from South Korea, as described to define individuals with a previous history of COVID-19 infection, vaccination, or both, as persons with presumed immunity.
Results
Of a total of 53,304,627 observed persons, 24.4% had vaccination and infection, 58.1% had vaccination and no infection, 7.6% had infection and no vaccination, and 9.9% had no immunity. The SARS-CoV-2 Omicron variant emerged at a time when the presumed population immunity ranged from 80% to 85%; however, nearly half of the children were presumed to have no immunity.
Conclusion
We report a gap in population immunity, with lower presumed protection in children than in adults. The approach presented in this work can provide valuable informed tools to assist vaccine policy-making at a national level.
Characteristics of COVID-19 outbreaks and risk factors for transmission at an army training center in South Korea from June to August 2021
U Jin Cho, Seongjin Wang, Seonju Yi, Yeon Hwa Choi, Eun-Young Kim, Jin A Kim, Sanghwan Bae, Jungyeon Yu, Jangkyu Choi, Young-Joon Park
Osong Public Health Res Perspect. 2022;13(4):263-272.   Published online July 27, 2022
DOI: https://doi.org/10.24171/j.phrp.2022.0149
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AbstractAbstract PDF
Objectives
It is crucial to establish the characteristics of coronavirus disease 2019 (COVID-19) outbreaks at army training centers to develop preventive measures. Therefore, this study aimed to determine the COVID-19 transmission patterns and risk factors in a sequence of outbreaks at an army training center from June to August 2021.
Methods
This study included 1,324 trainees at an army training center where outbreaks occurred from June to August 2021. The outbreak was qualitatively analyzed according to the period, attack rate, demographic characteristics, vaccination history, and living areas. An aerodynamic experiment was performed to evaluate aerosol transmission in living areas.
Results
Three outbreaks occurred at the army training center from June to August 2021. The first, second, and third outbreaks lasted for 32, 17, and 24 days, and the attack rates were 12.8%, 18.1%, and 8.9%, respectively. Confirmed cases were distributed in all age groups. Recruits and the unvaccinated were at higher risk for COVID-19. The aerodynamic experiment verified the possibility of aerosol transmission within the same living area.
Conclusion
COVID-19 transmission at army training centers should be minimized through quarantine and post-admission testing during the latency period as part of integrated measures that include facility ventilation, vaccination, indoor mask-wearing, and social distancing.
Early Intervention Reduces the Spread of COVID-19 in Long-Term Care Facilities in the Republic of Korea
Shin Young Park, Gawon Choi, Hyeyoung Lee, Na-young Kim, Seon-young Lee, Kyungnam Kim, Soyoung Shin, Eunsu Jang, YoungSin Moon, KwangHwan Oh, JaeRin Choi, Sangeun Lee, Young-Man Kim, Jieun Kim, Seonju Yi, Jin Gwack, Ok Park, Young Joon Park
Osong Public Health Res Perspect. 2020;11(4):259-264.   Published online August 31, 2020
DOI: https://doi.org/10.24171/j.phrp.2020.11.4.16
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  • 132 Download
  • 7 Citations
AbstractAbstract PDF

This study describes the epidemiological characteristics of coronavirus disease 2019 (COVID-19) based on reported cases from long-term care facilities. As of April 20th, 2020, 3 long-term care facilities in a metropolitan area of South Korea had reported cases of COVID-19. These facilities’ employees were presumed to be the sources of infection. There were 2 nursing hospitals that did not report any additional cases. One nursing home had a total of 25 cases, with an attack rate of 51.4% (95% CI 35.6–67.0), and a fatality rate of 38.9% (95% CI 20.3–61.4) among residents. The results from this study suggest that early detection and maintenance of infection control minimizes the risk of rapid transmission.

Citations

Citations to this article as recorded by  
  • Staffing Levels and COVID-19 Infections and Deaths in Korean Nursing Homes
    Jiyeon Lee, Juh Hyun Shin, Kyeong Hun Lee, Charlene A. Harrington, Sun Ok Jung
    Policy, Politics, & Nursing Practice.2022; 23(1): 15.     CrossRef
  • An Experience of the Early Stage of COVID-19 Outbreak in Nursing Homes in Gyeonggi Province, Korea
    Gawon Choi, Na-young Kim, Seon-young Lee, Hae Deun Noh, Heeyoung Lee
    Korean Journal of Clinical Geriatrics.2022; 23(1): 27.     CrossRef
  • The implications of the COVID-19 pandemic for long term care facilities
    Muh-Yong Yen, Jonathan Schwartz, Po-Ren Hsueh
    Current Opinion in Infectious Diseases.2022; 35(4): 370.     CrossRef
  • Health impact of the first and second wave of COVID-19 and related restrictive measures among nursing home residents: a scoping review
    Marjolein E. A. Verbiest, Annerieke Stoop, Aukelien Scheffelaar, Meriam M. Janssen, Leonieke C. van Boekel, Katrien G. Luijkx
    BMC Health Services Research.2022;[Epub]     CrossRef
  • Epidemiology and clinical features of COVID-19 outbreaks in aged care facilities: A systematic review and meta-analysis
    Mohammad Rashidul Hashan, Nicolas Smoll, Catherine King, Hannah Ockenden-Muldoon, Jacina Walker, Andre Wattiaux, Julieanne Graham, Robert Booy, Gulam Khandaker
    EClinicalMedicine.2021; 33: 100771.     CrossRef
  • Protecting Nursing Homes and Long-Term Care Facilities From COVID-19: A Rapid Review of International Evidence
    Sally Hall Dykgraaf, Sethunya Matenge, Jane Desborough, Elizabeth Sturgiss, Garang Dut, Leslee Roberts, Alison McMillan, Michael Kidd
    Journal of the American Medical Directors Associat.2021; 22(10): 1969.     CrossRef
  • Dementia Risk among Coronavirus Disease Survivors: A Nationwide Cohort Study in South Korea
    Hye-Yoon Park, In-Ae Song, Tak-Kyu Oh
    Journal of Personalized Medicine.2021; 11(10): 1015.     CrossRef

PHRP : Osong Public Health and Research Perspectives