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Original Articles
Estimating the number of severe COVID-19 cases and COVID-19-related deaths averted by a nationwide vaccination campaign in Republic of Korea
Ji Hae Hwang, Ju Hee Lee, Eun Jung Jang, Ryu Kyung Kim, Kil Hun Lee, Seon Kyeong Park, Sang Eun Lee, Chungman Chae, Sangwon Lee, Young Joon Park
Osong Public Health Res Perspect. 2023;14(3):164-172.   Published online June 22, 2023
DOI: https://doi.org/10.24171/j.phrp.2023.0096
  • 2,133 View
  • 127 Download
  • 2 Web of Science
  • 2 Crossref
Graphical AbstractGraphical Abstract AbstractAbstract PDF
Objectives
The Korea Disease Control and Prevention Agency promotes vaccination by regularly providing information on its benefits for reducing the severity of coronavirus disease 2019 (COVID-19). This study aimed to analyze the number of averted severe COVID-19 cases and COVID-19-related deaths by age group and quantify the impact of Republic of Korea’s nationwide vaccination campaign.
Methods
We analyzed an integrated database from the beginning of the vaccination campaign on February 26, 2021 to October 15, 2022. We estimated the cumulative number of severe cases and COVID-19-related deaths over time by comparing observed and estimated cases among unvaccinated and vaccinated groups using statistical modeling. We compared daily age-adjusted rates of severe cases and deaths in the unvaccinated group to those in the vaccinated group and calculated the susceptible population and proportion of vaccinated people by age.
Results
There were 23,793 severe cases and 25,441 deaths related to COVID-19. We estimated that 119,579 (95% confidence interval [CI], 118,901–120,257) severe COVID-19 cases and 137,636 (95% CI, 136,909–138,363) COVID-19-related deaths would have occurred if vaccination had not been performed. Therefore, 95,786 (95% CI, 94,659–96,913) severe cases and 112,195 (95% CI, 110,870–113,520) deaths were prevented as a result of the vaccination campaign.
Conclusion
We found that, if the nationwide COVID-19 vaccination campaign had not been implemented, the number of severe cases and deaths would have been at least 4 times higher. These findings suggest that Republic of Korea’s nationwide vaccination campaign reduced the number of severe cases and COVID-19 deaths.

Citations

Citations to this article as recorded by  
  • Assessing the determinants of influenza and COVID-19 vaccine co-administration decisions in the elderly
    Seunghyun Lewis Kwon, So-Yeon Kim, Minju Song, Hyung-Min Lee, Seon-Hwa Ban, Mi-Soon Lee, Hyesun Jeong
    Human Vaccines & Immunotherapeutics.2024;[Epub]     CrossRef
  • Comparative Effectiveness of COVID-19 Bivalent Versus Monovalent mRNA Vaccines in the Early Stage of Bivalent Vaccination in Korea: October 2022 to January 2023
    Ryu Kyung Kim, Young June Choe, Eun Jung Jang, Chungman Chae, Ji Hae Hwang, Kil Hun Lee, Ji Ae Shim, Geun-Yong Kwon, Jae Young Lee, Young-Joon Park, Sang Won Lee, Donghyok Kwon
    Journal of Korean Medical Science.2023;[Epub]     CrossRef
Vaccine effectiveness and the epidemiological characteristics of a COVID-19 outbreak in a tertiary hospital in Republic of Korea
Seonhee Ahn, Tae Jong Son, Yoonsuk Jang, Jihyun Choi, Young Joon Park, Jiseon Seong, Hyun Hee Kwon, Muk Ju Kim, Donghyok Kwon
Osong Public Health Res Perspect. 2023;14(3):188-196.   Published online June 8, 2023
DOI: https://doi.org/10.24171/j.phrp.2023.0066
  • 1,671 View
  • 79 Download
Graphical AbstractGraphical Abstract AbstractAbstract PDF
Objectives
Healthcare facilities are high-risk sites for infection. This study analyzed the epidemiological characteristics of a coronavirus disease 2019 (COVID-19) outbreak in a tertiary hospital after COVID-19 vaccination had been introduced in Republic of Korea. Vaccine effectiveness (VE) and shared anti-infection strategies are also assessed.
Methods
The risk levels for 4,074 contacts were evaluated. The epidemiological characteristics of confirmed cases were evaluated using the chi-square test. The “1 minus relative risk” method was used to determine VE in preventing infection, progression to severe disease, and death. In the largest affected area (the 8th floor), a separate relative risk analysis was conducted. A multivariate logistic regression analysis (with 95% confidence interval [CIs]) was used to identify transmission risk factors with a significance level <10% via the backward elimination method.
Results
In total, 181 cases of COVID-19 were confirmed, with an attack rate of 4.4%. Of those cases, 12.7% progressed to severe disease, and 8.3% died. In the cohort isolation area on the 8th floor, where 79.0% of the confirmed cases occurred, the adjusted odds ratio was 6.55 (95% CI, 2.99–14.33) and 2.19 (95% CI, 1.24–3.88) for caregivers and the unvaccinated group, respectively. VE analysis revealed that 85.8% of the cases that progressed to severe disease and 78.6% of the deaths could be prevented by administering a second vaccine.
Conclusion
Caregiver training for infection prevention and control is necessary to reduce infection risk. Vaccination is an important intervention to reduce the risk of progression to severe disease and death.
Brief Reports
Early countermeasures to COVID-19 at long-term care facilities in Gwangju Metropolitan City, Republic of Korea
Hye-Jin Kim, Jieun Kim, Yoon Suk Jang, Hanul Park, Jong Mu Kim, Young Joon Park, So-Yeon Ryu, Jun Hwi Cho, So Yeong Park, Sang-Eun Lee
Osong Public Health Res Perspect. 2023;14(1):59-65.   Published online February 1, 2023
DOI: https://doi.org/10.24171/j.phrp.2022.0293
  • 2,161 View
  • 86 Download
Graphical AbstractGraphical Abstract AbstractAbstract PDF
Objectives
The coronavirus disease 2019 (COVID-19) pandemic has continued since its first detection in the Republic of Korea on January 20, 2020. This study describes the early countermeasures used to minimize the risk of COVID-19 outbreaks during cohort quarantine and compares the epidemiological characteristics of 2 outbreaks in long-term care facilities (LTCFs) in Gwangju Metropolitan City in summer 2020. Methods: An epidemiological investigation was conducted via direct visits. We investigated epidemiological characteristics, including incidence, morbidity, and mortality rates, for all residents and staff members. Demographic characteristics were analyzed using a statistical program. Additionally, the method of managing infection in LTCFs is described. Results: Residents and caregivers had high incidence rates in LTCF-A and LTCF-B, respectively. LTCF-B had a longer quarantine period than LTCF-A. The attack rate was 20.02% in LTCF-A and 27.9% in LTCF-B. The mortality rate was 2.3% (1/43) in LTCF-B, the only facility in which a COVID-19 death occurred. Conclusion: Extensive management requires contact minimization, which involves testing all contacts to mitigate further transmission in the early stages of LTCF outbreaks. The findings of this study can help inform and prepare public health authorities for COVID-19 outbreaks, particularly for early control in vulnerable facilities.
The effectiveness of Paxlovid treatment in long-term care facilities in South Korea during the outbreak of the Omicron variant of SARS-CoV-2
Hanul Park, Young Joon Park, Hye Young Lee, Mi Yu, Yeong-Jun Song, Sang Eun Lee, Ji-Joo Lee, Eun-Sol Lee, Yeonjung Kim
Osong Public Health Res Perspect. 2022;13(6):443-447.   Published online December 23, 2022
DOI: https://doi.org/10.24171/j.phrp.2022.0262
  • 4,222 View
  • 223 Download
  • 7 Web of Science
  • 10 Crossref
Graphical AbstractGraphical Abstract AbstractAbstract PDF
Objectives
On November 5, 2021, Pfizer Inc. announced Paxlovid (nirmatrelvir +ritonavir) asa treatment method that could reduce the risk of hospitalization or death for patients withconfirmed coronavirus disease 2019 (COVID-19).Methods: From February 6, 2022 to April 2, 2022, the incidence of COVID-19 and the effectsof treatment with Paxlovid were analyzed in 2,241 patients and workers at 5 long-term carefacilities during the outbreak of the Omicron variant of severe acute respiratory syndromecoronavirus 2 in South Korea.Results: The rate of severe illness or death in the group given Paxlovid was 51% lower thanthat of the non-Paxlovid group (adjusted risk ratio [aRR], 0.49; 95% confidence interval [CI],0.24−0.98). Compared to unvaccinated patients, patients who had completed 3 doses of thevaccine had a 71% reduced rate of severe illness or death (aRR, 0.29; 95% CI, 0.13−0.64) and a65% reduced death rate (aRR, 0.35; 95% CI, 0.15−0.79).Conclusion: Patients given Paxlovid showed a lower rate of severe illness or death and alower fatality rate than those who did not receive Paxlovid. Patients who received 3 dosesof the vaccine had a lower rate of severe illness or death and a lower fatality rate than theunvaccinated group.

Citations

Citations to this article as recorded by  
  • Efficacy and safety of antiviral treatments for symptomatic COVID-19 outpatients: Systematic review and network meta-analysis
    Meital Zur, Thalia Peselev, Stav Yanko, Victoria Rotshild, Ilan Matok
    Antiviral Research.2024; 221: 105768.     CrossRef
  • Clinical Effectiveness of Ritonavir-Boosted Nirmatrelvir—A Literature Review
    Sydney Paltra, Tim O. F. Conrad
    Advances in Respiratory Medicine.2024; 92(1): 66.     CrossRef
  • Effectiveness of nirmatrelvir‐ritonavir on severe outcomes of COVID‐19 in the era of vaccination and Omicron: An updated meta‐analysis
    Sien Ombelet, Diego Castanares‐Zapatero, Fabian Desimpel, Frank Hulstaert, Sabine Stordeur, Dominique Roberfroid
    Journal of Medical Virology.2024;[Epub]     CrossRef
  • Epidemiological evolution and economic impact of the COVID-19 pandemic in the European Union and worldwide and effects of control strategies on them: An ecological study
    J.A. Caylà, J.M. Bellmunt, J.M. Jansà, A. Marco, J.P. Millet
    Medicina de Familia. SEMERGEN.2024; 50(6): 102274.     CrossRef
  • COVID‐19 infection in patients with haematological malignancies: A single‐centre survey in the latest Omicron wave in China
    Xiaolu Zhu, Qian Jiang, Jin Lu, Yuqian Sun, Xiaosu Zhao, Shenmiao Yang, Feifei Tang, Wenjing Yu, Ting Zhao, Xiaohong Liu, Jinsong Jia, Wenbing Duan, Lijuan Hu, Jing Wang, Yang Liu, Nan Peng, Xuelin Dou, Rui Ma, Qiang Fu, Huifang Wang, Kaiyan Liu, Xiaojun
    British Journal of Haematology.2023; 202(1): 31.     CrossRef
  • The association mental health of adolescents with economic impact during the COVID-19 pandemic: a 2020 Korean nationally representative survey
    Hanul Park, Kang-Sook Lee
    BMC Public Health.2023;[Epub]     CrossRef
  • Efficacy and safety of paxlovid (nirmatrelvir/ritonavir) in the treatment of COVID‐19: An updated meta‐analysis and trial sequential analysis
    Haokun Tian, Changsen Yang, Tiangang Song, Kechen Zhou, Lequan Wen, Ye Tian, Lirui Tang, Weikai Xu, Xinyuan Zhang
    Reviews in Medical Virology.2023;[Epub]     CrossRef
  • Real-World Effectiveness of Nirmatrelvir-Ritonavir and Its Acceptability in High-Risk COVID-19 Patients
    Min-Kyung Kim, Kyung-Shin Lee, Sin Young Ham, Youn Young Choi, Eunyoung Lee, Seungjae Lee, Bora Lee, Jaehyun Jeon, BumSik Chin, Yeonjae Kim, Gayeon Kim, Hee-Chang Jang, Jae-Phil Choi, Sang-Won Park
    Journal of Korean Medical Science.2023;[Epub]     CrossRef
  • Effectiveness of Molnupiravir Treatment in Patients with COVID-19 in Korea: A Propensity Score Matched Study
    Hye Rim Park, Min-Gyu Yoo, Jong Mu Kim, Soon Jong Bae, Hyungmin Lee, Jungyeon Kim
    Infection & Chemotherapy.2023; 55(4): 490.     CrossRef
  • Nirmatrelvir combined with ritonavir for preventing and treating COVID-19
    Stefanie Reis, Maria-Inti Metzendorf, Rebecca Kuehn, Maria Popp, Ildiko Gagyor, Peter Kranke, Patrick Meybohm, Nicole Skoetz, Stephanie Weibel
    Cochrane Database of Systematic Reviews.2023;[Epub]     CrossRef
Original Article
mRNA vaccine effectiveness against SARS-CoV-2 B.1.617.2 (Delta) and B.1.1.529 (Omicron) variant transmission from home care cases to household contacts in South Korea
Hanul Park, Young Joon Park, Sang Eun Lee, Min Jei Lee, Hyungtae Ahn
Osong Public Health Res Perspect. 2022;13(6):435-442.   Published online November 28, 2022
DOI: https://doi.org/10.24171/j.phrp.2022.0243
  • 5,050 View
  • 175 Download
  • 1 Web of Science
  • 1 Crossref
Graphical AbstractGraphical Abstract AbstractAbstract PDF
Objectives
Household contacts of confirmed cases of coronavirus disease 2019 (COVID-19) areexposed to a high risk of viral transmission, and secondary incidence is an important indicatorof community transmission. This study analyzed the secondary attack rate and mRNA vaccineeffectiveness against transmission (VET) for index cases (patients treated at home) confirmedto be infected with the Delta and Omicron variants.Methods: The subjects of the study were 4,450 index cases and 10,382 household contacts.Logistic regression analysis was performed to compare the secondary attack rate byvaccination status, and adjusted relative risk and 95% confidence intervals were identified.Results: The secondary attack rate of the Delta variant was 27.3%, while the secondary attackrate of the Omicron variant was 29.8%. For the Delta variant, groups with less than 90 daysand more than 90 days after 2 doses of mRNA vaccination both showed a VET of 37%. For theOmicron variant, a 64% VET was found among those with less than 90 days after 2 doses ofmRNA vaccination.Conclusion: This study provides useful data on the secondary attack rate and VET of mRNAvaccines for household contacts of COVID-19 cases in South Korea.

Citations

Citations to this article as recorded by  
  • Household secondary attack rates and risk factors during periods of SARS-CoV-2 Delta and Omicron variant predominance in the Republic of Korea
    Jin Lee, Mijeong Ko, Seontae Kim, Dosang Lim, Gemma Park, Sang-Eun Lee
    Osong Public Health and Research Perspectives.2023; 14(4): 263.     CrossRef
Brief Report
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
  • 6,822 View
  • 153 Download
  • 8 Web of Science
  • 11 Crossref
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  
  • Impact of the COVID-19 pandemic and corresponding control measures on long-term care facilities: a systematic review and meta-analysis
    Jun Zhang, Yushan Yu, Mirko Petrovic, Xiaomei Pei, Qing-Bao Tian, Lei Zhang, Wei-Hong Zhang
    Age and Ageing.2023;[Epub]     CrossRef
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    Lili Li, Araz Taeihagh, Si Ying Tan
    Nature Communications.2023;[Epub]     CrossRef
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    Toshiyuki Shibata, Sawa Okano, Daisuke Onozuka, Etsuko Ohta, Satoshi Kutsuna
    International Journal of Environmental Research an.2023; 20(20): 6926.     CrossRef
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    Myonghwa Park, Jinju Kim, Jihye Jung, Seonhwa Kim, Jinhee Lee, Dongyoung Lee
    Journal of Korean Gerontological Nursing.2023; 25(4): 377.     CrossRef
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    Policy, Politics, & Nursing Practice.2022; 23(1): 15.     CrossRef
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    Korean Journal of Clinical Geriatrics.2022; 23(1): 27.     CrossRef
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    Current Opinion in Infectious Diseases.2022; 35(4): 370.     CrossRef
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    BMC Health Services Research.2022;[Epub]     CrossRef
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    Journal of Personalized Medicine.2021; 11(10): 1015.     CrossRef
Original Article
Development and Utilization of a Rapid and Accurate Epidemic Investigation Support System for COVID-19
Young Joon Park, Sang Yun Cho, Jin Lee, Ikjin Lee, Won-Ho Park, Seungmyeong Jeong, Seongyun Kim, Seokjun Lee, Jaeho Kim, Ok Park
Osong Public Health Res Perspect. 2020;11(3):118-127.   Published online May 20, 2020
DOI: https://doi.org/10.24171/j.phrp.2020.11.3.06
  • 13,190 View
  • 309 Download
  • 22 Web of Science
  • 23 Crossref
AbstractAbstract PDF
Objectives

In this pandemic situation caused by a novel coronavirus disease in 2019 (COVID-19), an electronic support system that can rapidly and accurately perform epidemic investigations, is needed. It would systematically secure and analyze patients’ data (who have been confirmed to have the infection), location information, and credit card usage.

Methods

The “Infectious Disease Prevention and Control Act” in South Korea, established a legal basis for the securement, handling procedure, and disclosure of information required for epidemic investigations. The Epidemic Investigation Support System (EISS) was developed as an application platform on the Smart City data platform.

Results

The EISS performed the function of inter-institutional communication which reduced the processing period of patients’ data in comparison to other methods. This system automatically marked confirmed cases’ tracking data on a map and hot-spot analysis which lead to the prediction of areas where people may be vulnerable to infection.

Conclusion

The EISS was designed and implemented for use during an epidemic investigation to prevent the spread of an infectious disease, by specifically tracking confirmed cases of infection.

Citations

Citations to this article as recorded by  
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    East Asian Science, Technology and Society: An Int.2024; 18(1): 22.     CrossRef
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PHRP : Osong Public Health and Research Perspectives