Osong Public Health and Research Perspectives

Original Articles

Evaluation of COVID-19 vaccine effectiveness in different high-risk facility types during a period of Delta variant dominance in the Republic of Korea: a cross-sectional study: Min Jei Lee, Myung-Jae Hwang, Dong Seob Kim, Seon Kyeong Park, Jihyun Choi, Ji Joo Lee, Jong Mu Kim, Young-Man Kim, Young-Joon Park, Jin Gwack, Sang-Eun Lee; Osong Public Health Res Perspect. 2023;14(5):418-426. Published online October 19, 2023; DOI: https://doi.org/10.24171/j.phrp.2023.0188

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Graphical Abstract Abstract PDF: Objectives
We evaluated the effectiveness of coronavirus disease 2019 vaccination in high-risk facilities in the Republic of Korea during the period when the highly transmissible Delta variant was prevalent. Additionally, we aimed to explore any disparities in vaccine effectiveness (VE) across various types of institutions, specifically distinguishing between non-medical and medical establishments. Methods: We examined 8 outbreak clusters covering 243 cases and 895 contacts from 8 high-risk facilities divided into 2 groups: group A (4 non-medical institutions) and group B (4 medical institutions). These clusters were observed from July 27, 2021 to October 16, 2021 for the attack rate (AR) and VE with respect to disease severity. A generalized linear model with a binomial distribution was used to determine the odds ratio (OR) for disease severity and death. Results: AR was notably lower in group B (medical institutions). Furthermore, VE analysis revealed that group A exhibited higher effectivity for disease severity and death than group B. The OR for disease severity was 0.24 (95% confidence interval [CI], 0.03–2.16) for group A and 0.27 (95% CI, 0.12–0.64) for group B, with the OR for death at 0.12 (95% CI, 0.01–1.32) in group A and 0.34 (95% CI, 0.14–0.87) in group B. Conclusion: Although VE may vary across institutions, our findings underscore the importance of implementing vaccinations in high-risk facilities. Customized vaccination programs, tailored response plans, and competent management personnel are essential for effectively addressing and mitigating public health challenges.

The first reported hepatitis E outbreak in a food manufacturing factory: Korea, 2022: Hansol Yeom, Soonryu Seo, Youngsil Yoon, Jaeeun Lee, Myung-Guk Han, Deog-Yong Lee, Sun-Whan Park, Song A Park, Sook-Hyang Jeong, Jin Gwack; Osong Public Health Res Perspect. 2023;14(1):15-22. Published online February 22, 2023; DOI: https://doi.org/10.24171/j.phrp.2022.0305

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Graphical Abstract Abstract PDF: Objectives
On February 16, 2022, 12 cases of hepatitis E virus (HEV) infection were reported in a food manufacturing factory in Korea. The aim of this study was to identify additional cases and to determine the source of this HEV outbreak. Methods: This study was an in-depth investigation of 12 HEV immunoglobulin M (IgM)-positive cases and their demographic, clinical, and epidemiological characteristics. On-site specimens were collected from the environment and from humans, and a follow-up investigation was conducted 2 to 3 months after the outbreak. Results: Among 80 production workers in the factory, 12 (15.0%) had acute HEV infection, all of whom were asymptomatic. The follow-up investigation showed that 3 cases were HEV IgMpositive, while 6 were HEV IgG-positive. HEV genes were not detected in the HEV IgM-positive specimens. HEV genes were not detected in the food products or environmental specimens collected on-site. HEV was presumed to be the causative pathogen. However, it could not be confirmed that the source of infection was common consumption inside the factory. Conclusion: This was the first domestic case of an HEV infection outbreak in a food manufacturing factory in Korea. Our results provide information for the future control of outbreaks and for the preparation of measures to prevent domestic outbreaks of HEV infection.

Clinical outcomes of remdesivir-treated COVID-19 patients in South Korea: Mi Yu, Bryan Inho Kim, Jungyeon Kim, Jin Gwack; Osong Public Health Res Perspect. 2022;13(5):370-376. Published online October 18, 2022; DOI: https://doi.org/10.24171/j.phrp.2022.0138

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Abstract PDF

Objectives
This study analyzed the clinical outcomes of remdesivir treatment in coronavirus disease 2019 (COVID-19) patients in South Korea.
Methods
This retrospective cohort study involved the secondary analysis of epidemiological data. Among patients diagnosed with COVID-19 from July 2, 2020 to March 23, 2021 (12 AM), 4,868 who received oxygen therapy and were released from isolation after receiving remdesivir treatment were assigned to the treatment group, and 6,068 patients who received oxygen therapy but not remdesivir were assigned to the untreated group. The study subjects included children under the age of 19. The general characteristics and severity were compared between the groups. Differences in the time to death and mortality were also compared.
Results
In the untreated group, the hazard ratio [HR] for mortality was 1.59 among patients aged ≥70 years and 2.32 in patients with severe disease in comparison to the treatment group. In a comparison of survival time among patients with severe disease aged ≥70 years, the HR for mortality before 50 days was 2.09 in the untreated group compared to the treatment group.
Conclusion
Patients with remdesivir treatment showed better clinical outcomes in this study, but these results should be interpreted with caution since this study was not a fully controlled clinical trial.

Citations

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The Role of Multidimensional Prognostic Index to Identify Hospitalized Older Adults with COVID-19 Who Can Benefit from Remdesivir Treatment: An Observational, Prospective, Multicenter Study
Carlo Custodero, Nicola Veronese, Eva Topinkova, Helena Michalkova, Maria Cristina Polidori, Alberto Cella, Alfonso J. Cruz-Jentoft, Christine A. F. von Arnim, Margherita Azzini, Heidi Gruner, Alberto Castagna, Giovanni Cenderello, Romina Custureri, Tania
Drugs & Aging.2023; 40(7): 643. CrossRef
Remdesivir: A Review in COVID-19
Hannah A. Blair
Drugs.2023; 83(13): 1215. CrossRef

Clinical epidemiological applicability of real-time polymerase chain reaction for COVID-19: Geehyuk Kim, Jun-Kyu Kang, Jungho Kim, Jiyoung Lee, Jin Gwack; Osong Public Health Res Perspect. 2022;13(4):252-262. Published online July 27, 2022; DOI: https://doi.org/10.24171/j.phrp.2022.0135

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Graphical Abstract Abstract PDF: Objectives
Real-time polymerase chain reaction is currently used as a confirmatory test for coronavirus disease 2019 (COVID-19). The test results are interpreted as positive, negative, or inconclusive, and are used only for a qualitative classification of patients. However, the test results can be quantitated using threshold count (Ct) values to determine the amount of virus present in the sample. Therefore, this study investigated the diagnostic usefulness of Ct results through various quantitative analyzes, along with an analysis of clinical and epidemiological characteristics.
Methods
Clinical and epidemiological data from 4,642 COVID-19 patients in April 2021 were analyzed, including the Ct values of the RNA-dependent RNA polymerase (RdRp), envelope (E), and nucleocapsid (N) genes. Clinical and epidemiological data (sex, age, underlying diseases, and early symptoms) were collected through a structured questionnaire. A correlation analysis was used to examine the relationships between variables.
Results
All 3 genes showed statistically significant relationships with symptoms and severity levels. The Ct values of the RdRp gene decreased as the severity of the patients increased. Moreover, statistical significance was observed for the presence of underlying diseases and dyspnea.
Conclusion
Ct values were found to be related to patients’ clinical and epidemiological characteristics. In particular, since these factors are closely related to symptoms and severity, Ct values can be used as primary data for predicting patients’ disease prognosis despite the limitations of this method. Conducting follow-up studies to validate this approach might enable using the data from this study to establish policies for preventing COVID-19 infection and spread.

Brief Reports

Genomic Surveillance of SARS-CoV-2: Distribution of Clades in the Republic of Korea in 2020: Ae Kyung Park, Il-Hwan Kim, Junyoung Kim, Jeong-Min Kim, Heui Man Kim, Chae young Lee, Myung-Guk Han, Gi-Eun Rhie, Donghyok Kwon, Jeong-Gu Nam, Young-Joon Park, Jin Gwack, Nam-Joo Lee, SangHee Woo, Jin Sun No, Jaehee Lee, Jeemin Ha, JeeEun Rhee, Cheon-Kwon Yoo, Eun-Jin Kim; Osong Public Health Res Perspect. 2021;12(1):37-43. Published online February 23, 2021; DOI: https://doi.org/10.24171/j.phrp.2021.12.1.06

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22 Citations

Abstract PDF

Since a novel beta-coronavirus, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) was first reported in December 2019, there has been a rapid global spread of the virus. Genomic surveillance was conducted on samples isolated from infected individuals to monitor the spread of genetic variants of SARS-CoV-2 in Korea. The Korea Disease Control and Prevention Agency performed whole genome sequencing of SARS-CoV-2 in Korea for 1 year (January 2020 to January 2021). A total of 2,488 SARS-CoV-2 cases were sequenced (including 648 cases from abroad). Initially, the prevalent clades of SARS-CoV-2 were the S and V clades, however, by March 2020, GH clade was the most dominant. Only international travelers were identified as having G or GR clades, and since the first variant 501Y.V1 was identified (from a traveler from the United Kingdom on December 22^nd, 2020), a total of 27 variants of 501Y.V1, 501Y.V2, and 484K.V2 have been classified (as of January 25^th, 2021). The results in this study indicated that quarantining of travelers entering Korea successfully prevented dissemination of the SARS-CoV-2 variants in Korea.

Citations

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Jeong-Min Kim, Dongju Kim, Nam-Joo Lee, Sang Hee Woo, Jaehee Lee, Hyeokjin Lee, Ae Kyung Park, Jeong-Ah Kim, Chae Young Lee, Il-Hwan Kim, Cheon Kwon Yoo, Eun-Jin Kim
Osong Public Health and Research Perspectives.2023; 14(4): 272. CrossRef
Rapid Emergence of the Omicron Variant of Severe Acute Respiratory Syndrome Coronavirus 2 in Korea
Ae Kyung Park, Il-Hwan Kim, Chae Young Lee, Jeong-Ah Kim, Hyeokjin Lee, Heui Man Kim, Nam-Joo Lee, SangHee Woo, Jaehee Lee, JeeEun Rhee, Cheon-Kwon Yoo, Eun-Jin Kim
Annals of Laboratory Medicine.2023; 43(2): 211. CrossRef
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Heui Man Kim, Eun Ju Lee, Sang Won O, Yong Jun Choi, Hyeokjin Lee, Sae Jin Oh, Jeong-Min Kim, Ae Kyung Park, Jeong-Ah Kim, Chae young Lee, Jong Mu Kim, Hanul Park, Young Joon Park, Jeong-Hee Yu, Eun-Young Kim, Hwa-Pyeong Ko, Eun-Jin Kim
Viral Immunology.2023; 36(3): 203. CrossRef
COVID-19 Cases and Deaths among Healthcare Personnel with the Progression of the Pandemic in Korea from March 2020 to February 2022
Yeonju Kim, Sung-Chan Yang, Jinhwa Jang, Shin Young Park, Seong Sun Kim, Chansoo Kim, Donghyok Kwon, Sang-Won Lee
Tropical Medicine and Infectious Disease.2023; 8(6): 308. CrossRef
The COVID-19 pandemic and healthcare utilization in Iran: evidence from an interrupted time series analysis
Monireh Mahmoodpour-Azari, Satar Rezaei, Nasim Badiee, Mohammad Hajizadeh, Ali Mohammadi, Ali Kazemi-Karyani, Shahin Soltani, Mehdi Khezeli
Osong Public Health and Research Perspectives.2023; 14(3): 180. CrossRef
Online Phylogenetics with matOptimize Produces Equivalent Trees and is Dramatically More Efficient for Large SARS-CoV-2 Phylogenies than de novo and Maximum-Likelihood Implementations
Alexander M Kramer, Bryan Thornlow, Cheng Ye, Nicola De Maio, Jakob McBroome, Angie S Hinrichs, Robert Lanfear, Yatish Turakhia, Russell Corbett-Detig, Olivier Gascuel
Systematic Biology.2023; 72(5): 1039. CrossRef
Genomic epidemiology of SARS-CoV-2 variants in South Korea between January 2020 and February 2023
Il-Hwan Kim, Jin Sun No, Jeong-Ah Kim, Ae Kyung Park, HyeokJin Lee, Jeong-Min Kim, Nam-Joo Lee, Chi-Kyeong Kim, Chae Young Lee, SangHee Woo, Jaehee Lee, JeeEun Rhee, Eun-Jin Kim
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Genomic evidence of SARS‐CoV‐2 reinfection in the Republic of Korea
Ae Kyung Park, Jee Eun Rhee, Il‐Hwan Kim, Heui Man Kim, Hyeokjin Lee, Jeong‐Ah Kim, Chae Young Lee, Nam‐Joo Lee, SangHee Woo, Jaehee Lee, Jin Sun No, Gi‐Eun Rhie, Seong Jin Wang, Sang‐Eun Lee, Young Joon Park, Gemma Park, Jung Yeon Kim, Jin Gwack, Cheon‐K
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SARS-CoV-2 B.1.619 and B.1.620 Lineages, South Korea, 2021
Ae Kyung Park, Il-Hwan Kim, Heui Man Kim, Hyeokjin Lee, Nam-Joo Lee, Jeong-Ah Kim, SangHee Woo, Chae young Lee, Jaehee Lee, Sae Jin Oh, JeeEun Rhee, Cheon-Kwon Yoo, Eun-Jin Kim
Emerging Infectious Diseases.2022; 28(2): 415. CrossRef
Humoral and Cellular Responses to COVID-19 Vaccines in SARS-CoV-2 Infection-Naïve and -Recovered Korean Individuals
Ji-Young Hwang, Yunhwa Kim, Kyung-Min Lee, Eun-Jeong Jang, Chang-Hoon Woo, Chang-Ui Hong, Seok-Tae Choi, Sivilay Xayaheuang, Jong-Geol Jang, June-Hong Ahn, Hosun Park
Vaccines.2022; 10(2): 332. CrossRef
Increase in Viral Load in Patients With SARS-CoV-2 Delta Variant Infection in the Republic of Korea
Jeong-Min Kim, Jee Eun Rhee, Myeongsu Yoo, Heui Man Kim, Nam-Joo Lee, Sang Hee Woo, Hye-Jun Jo, Donghyok Kwon, Sangwon Lee, Cheon Kwon Yoo, Eun-Jin Kim
Frontiers in Microbiology.2022;[Epub] CrossRef
Molecular Dynamics Studies on the Structural Stability Prediction of SARS-CoV-2 Variants Including Multiple Mutants
Kwang-Eun Choi, Jeong-Min Kim, Jee Eun Rhee, Ae Kyung Park, Eun-Jin Kim, Cheon Kwon Yoo, Nam Sook Kang
International Journal of Molecular Sciences.2022; 23(9): 4956. CrossRef
SARS-CoV-2 shedding dynamics and transmission in immunosuppressed patients
Jee-Soo Lee, Ki Wook Yun, Hyeonju Jeong, Boram Kim, Man Jin Kim, Jae Hyeon Park, Ho Seob Shin, Hyeon Sae Oh, Hobin Sung, Myung Gi Song, Sung Im Cho, So Yeon Kim, Chang Kyung Kang, Pyoeng Gyun Choe, Wan Beom Park, Nam Joong Kim, Myoung-Don Oh, Eun Hwa Choi
Virulence.2022; 13(1): 1242. CrossRef
Immunological and Pathological Peculiarity of Severe Acute Respiratory Syndrome Coronavirus 2 Beta Variant
Sunhee Lee, Gun Young Yoon, Su Jin Lee, Young-Chan Kwon, Hyun Woo Moon, Yu-Jin Kim, Haesoo Kim, Wooseong Lee, Gi Uk Jeong, Chonsaeng Kim, Kyun-Do Kim, Seong-Jun Kim, Dae-Gyun Ahn, Miguel Angel Martinez
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Clinical scoring system to predict viable viral shedding in patients with COVID-19
Sung Woon Kang, Heedo Park, Ji Yeun Kim, Sunghee Park, So Yun Lim, Sohyun Lee, Joon-Yong Bae, Jeonghun Kim, Seongman Bae, Jiwon Jung, Min Jae Kim, Yong Pil Chong, Sang-Oh Lee, Sang-Ho Choi, Yang Soo Kim, Sung-Cheol Yun, Man-Seong Park, Sung-Han Kim
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Sung-mok Jung, Kyungmin Huh, Munkhzul Radnaabaatar, Jaehun Jung
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Sanghoo Lee, Mi-Kyeong Lee, Hyeongkyun Na, Jinwoo Ahn, Gayeon Hong, Youngkee Lee, Jimyeong Park, Yejin Kim, Yun-Tae Kim, Chang-Ki Kim, Hwan-Sub Lim, Kyoung-Ryul Lee
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Review of Current COVID-19 Diagnostics and Opportunities for Further Development
Yan Mardian, Herman Kosasih, Muhammad Karyana, Aaron Neal, Chuen-Yen Lau
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Molecular Dynamics Studies on the Structural Characteristics for the Stability Prediction of SARS-CoV-2
Kwang-Eun Choi, Jeong-Min Kim, JeeEun Rhee, Ae Kyung Park, Eun-Jin Kim, Nam Sook Kang
International Journal of Molecular Sciences.2021; 22(16): 8714. CrossRef
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Taewon Han, Boyeong Ryu, Suyeon Lee, Yugyeong Song, Yoongje Jeong, Ilhwan Kim, Jeongmin Kim, Eunjin Kim, Wonjun Lee, Hyunju Lee, Haekyoung Hwang
One Health.2021; 13: 100328. CrossRef
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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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Abstract 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 20^th, 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

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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
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Lili Li, Araz Taeihagh, Si Ying Tan
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Analysis of Concentrated COVID-19 Outbreaks in Elderly Facilities in Suita City, Osaka Prefecture, Japan
Toshiyuki Shibata, Sawa Okano, Daisuke Onozuka, Etsuko Ohta, Satoshi Kutsuna
International Journal of Environmental Research an.2023; 20(20): 6926. CrossRef
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
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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
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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
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Dementia Risk among Coronavirus Disease Survivors: A Nationwide Cohort Study in South Korea
Hye-Yoon Park, In-Ae Song, Tak-Kyu Oh
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Epidemic Intelligence Service Officers and Field Epidemiology Training Program in Korea: Geun-Yong Kwon, Shinje Moon, Wooseok Kwak, Jin Gwack, Chaeshin Chu, Seung-Ki Youn; Osong Public Health Res Perspect. 2013;4(4):215-221. Published online August 31, 2013; DOI: https://doi.org/10.1016/j.phrp.2013.07.001

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Korea has adopted Epidemic Intelligence Service (EIS) officers through the Field Epidemiology Training Program (FETP) since 1999 for systematic control of emerging and re-emerging infectious diseases. Graduates of medical schools in Korea are selected and serve as public health doctors (PHDs) for their mandatory military service. The duration of service is 3 years and PHDs comprise general practitioners and specialists. Some PHDs are selected as EIS officers with 3 weeks basic FETP training and work for central and provincial public health authorities to conduct epidemiological investigations. The total number of EIS officers is 31 as of 2012. The Korea Centers for Disease Control and Prevention (KCDC) has 12 specialists, whereas specialists and each province has one or two EIS officers to administer local epidemiological investigations in 253 public health centers. The Korean EIS officers have successfully responded and prevented infectious diseases, but there is a unique limitation: the number of PHDs in Korea is decreasing and PHDs are not allowed to stay outside Korea, which makes it difficult to cope with overseas infectious diseases. Furthermore, after 3 years service, they quit and their experiences are not accumulated. KCDC has hired full-time EIS officers since 2012 to overcome this limitation.

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Review for the Korean Health Professionals and International Cooperation Doctors Dispatched to Peru by the Korea International Cooperation Agency (KOICA)
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From Seoul to Lima: Korean Doctors in Peru
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Emerging Pathogens and Vehicles of Food- and Water-borne Disease Outbreaks in Korea, 2007–2012
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Original Articles

Are There Spatial and Temporal Correlations in the Incidence Distribution of Scrub Typhus in Korea?: Maengseok Noh, Youngjo Lee, Chaeshin Chu, Jin Gwack, Seung-Ki Youn, Sun Huh; Osong Public Health Res Perspect. 2013;4(1):39-44. Published online February 28, 2013; DOI: https://doi.org/10.1016/j.phrp.2013.01.002

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Abstract PDF

Objectives
A hierarchical generalized linear model (HGLM) was applied to estimate the transmission pattern of scrub typhus from 2001 to 2011 in the Republic of Korea, based on spatial and temporal correlation.
Methods
Based on the descriptive statistics of scrub typhus incidence from 2001 to 2011 reported to the Korean Centers for Disease Control and Prevention, the spatial and temporal correlations were estimated by HGLM. Incidences according to age, sex, and year were also estimated by the best-fit model out of nine HGLMs. A disease map was drawn to view the annual regional spread of the disease.
Results
The total number of scrub typhus cases reported from 2001 to 2011 was 51,136: male, 18,628 (36.4%); female, 32,508 (63.6%). The best-fit model selected was a combination of the spatial model (Markov random-field model) and temporal model (first order autoregressive model) of scrub typhus transmission. The peak incidence was 28.80 per 100,000 persons in early October and the peak incidence was 40.17 per 100,000 persons in those aged 63.3 years old by the best-fit HGLM. The disease map showed the spread of disease from the southern central area to a nationwide area, excepting Gangwon-do (province), Gyeongsangbuk-do (province), and Seoul.
Conclusion
In the transmission of scrub typhus in Korea, there was a correlation to the incidence of adjacent areas, as well as that of the previous year. According to the disease map, we are unlikely to see any decrease in the incidence in the near future, unless ongoing aggressive measures to prevent the exposure to the vector, chigger mites, in rural areas, are put into place.

Citations

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Prevalence of chigger mites and Orientia tsutsugamushi strains in northern regions of Gangwon-do, Korea
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Parasites, Hosts and Diseases.2023; 61(3): 263. CrossRef
Urine Metabolite of Mice with Orientia tsutsugamushi Infection
Sangho Choi, Do-Hwan Ahn, Min-Gyu Yoo, Hye-Ja Lee, Seong Beom Cho, Hee-Bin Park, Sung Soon Kim, Hyuk Chu
The American Journal of Tropical Medicine and Hygi.2023; 108(2): 296. CrossRef
Spatiotemporal dynamics and environmental determinants of scrub typhus in Anhui Province, China, 2010–2020
Xianyu Wei, Junyu He, Wenwu Yin, Ricardo J. Soares Magalhaes, Yanding Wang, Yuanyong Xu, Liang Wen, Yehuan Sun, Wenyi Zhang, Hailong Sun
Scientific Reports.2023;[Epub] CrossRef
Epidemiological characteristics of cases with scrub typhus and their correlation with chigger mite occurrence (2019–2021): A focus on case occupation and activity locations
Se‐Jin Jeong, Jin‐Hwan Jeon, Kyung won Hwang
Entomological Research.2023; 53(7): 247. CrossRef
Epidemiological characteristics and spatiotemporal patterns of scrub typhus in Yunnan Province from 2006 to 2017
Pei-Ying Peng, Lei Xu, Gu-Xian Wang, Wen-Yuan He, Ting-Liang Yan, Xian-Guo Guo
Scientific Reports.2022;[Epub] CrossRef
Clinical and Laboratory Predictors associated with Complicated Scrub Typhus
Mi-Hee Kim, Si-Hyun Kim, Jung-Hyun Choi, Seong-Heon Wie
Infection & Chemotherapy.2019; 51(2): 161. CrossRef
Awareness and Work-Related Factors Associated with Scrub Typhus: A Case-Control Study from South Korea
Dong-Seob Kim, Dilaram Acharya, Kwan Lee, Seok-Ju Yoo, Ji-Hyuk Park, Hyun-Sul Lim
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Estimating the burden of scrub typhus: A systematic review
Ana Bonell, Yoel Lubell, Paul N. Newton, John A. Crump, Daniel H. Paris, Janet Foley
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Yi-Cheng Wu, Quan Qian, Ricardo J. Soares Magalhaes, Zhi-Hai Han, Wen-Biao Hu, Ubydul Haque, Thomas A. Weppelmann, Yong Wang, Yun-Xi Liu, Xin-Lou Li, Hai-Long Sun, Yan-Song Sun, Archie C. A. Clements, Shen-Long Li, Wen-Yi Zhang, Mathieu Picardeau
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Larval Chigger Mites Collected from Small Mammals in 3 Provinces, Korea
In-Yong Lee, Hyeon-Je Song, Yeon-Joo Choi, Sun-Hye Shin, Min-Kyung Choi, So-Hyun Kwon, E-Hyun Shin, Chan Park, Heung-Chul Kim, Terry A. Klein, Kyung-Hee Park, Won-Jong Jang
The Korean Journal of Parasitology.2014; 52(2): 225. CrossRef

Epidemiological Characteristics of Serologically Confirmed Q Fever Cases in South Korea, 2006–2011: Wooseok Kwak, Hyuk Chu, Seondo Hwang, Ji-Hyuk Park, Kyu Jam Hwang, Jin Gwack, Young-Sil Choi, Seung-Ki Youn, Mi-Yeoun Park; Osong Public Health Res Perspect. 2013;4(1):34-38. Published online February 28, 2013; DOI: https://doi.org/10.1016/j.phrp.2012.12.006

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Objectives
Q fever has been reported worldwide; however, there was almost no official report of Q fever in Korea. In this study, we describe the current status of human Q fever occurrence in Korea.
Methods
Demographic data of Q fever patients were collected from the National Notifiable Diseases Surveillance System from 2006 to 2011. Case investigation reports from regional public health departments were used for additional information, like risk factors and clinical manifestation, of the patients since 2008.
Results
There were 65 serologically confirmed cases during the study period. The annual notification rate of Q fever was 0.22 cases per million persons. The majority of cases were men (87.7%), adults (98.5%), and urban inhabitants (67.7%). Relevant exposures to risk factors were identified in 45.7% of patients. The most common symptoms of acute Q fever were fever (89.3%), myalgia (67.9%) and asthenia (53.6%). Two cases with endocarditis were identified in chronic Q fever.
Conclusion
This study suggests that Q fever has a low endemicity in Korea. However, management and research at national level is required for prevention of a future epidemic.

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Mengjiao Fu, Peisheng He, Xuan OuYang, Yonghui Yu, Bohai Wen, Dongsheng Zhou, Xiaolu Xiong, Qinghong Yuan, Jun Jiao
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Diagnostic usefulness of molecular detection of Coxiella burnetii from blood of patients with suspected acute Q fever
Moonsuk Bae, Choong Eun Jin, Joung Ha Park, Min Jae Kim, Yong Pil Chong, Sang-Oh Lee, Sang-Ho Choi, Yang Soo Kim, Jun Hee Woo, Yong Shin, Sung-Han Kim
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Clinical characteristics of acute Q fever patients in South Korea and time from symptom onset to serologic diagnosis
Jung Yeon Heo, Young Wha Choi, Eun Jin Kim, Seung Hun Lee, Seung Kwan Lim, Seon Do Hwang, Ju Young Lee, Hye Won Jeong
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Serologic Survey and Risk Factors forCoxiella burnetiiInfection among Dairy Cattle Farmers in Korea
Ji-Hyuk Park, Hyuk Chu, Seok-Ju Yoo, Kyu-Jam Hwang, Hyun-Sul Lim
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C.‐H. Lai, W. Sun, C.‐H. Lee, J.‐N. Lin, M.‐H. Liao, S.‐S. Liu, T.‐Y. Chang, K.‐F. Tsai, Y.‐C. Chang, H.‐H. Lin, Y.‐H. Chen
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Wenping Gong, Pengcheng Wang, Xiaolu Xiong, Jun Jiao, Xiaomei Yang, Bohai Wen, James E Samuel
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Autochthonous Lyme Borreliosis in Humans and Ticks in Korea: Shinje Moon, Jin Gwack, Kyu Jam Hwang, Donghyuk Kwon, Suyeon Kim, Yoontae Noh, Jongyul Roh, E-hyun Shin, Kyungjin Jeong, Wonseok Seok, Seung-Ki Youn; Osong Public Health Res Perspect. 2013;4(1):52-56. Published online February 28, 2013; DOI: https://doi.org/10.1016/j.phrp.2012.12.001

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Objective: This study aimed at finding epidemiological and clinical features of autochthonous Lyme borreliosis in humans through epidemiological investigations and identifying its vectors and pathogens through analysis of ticks.
Method
Epidemiological investigations, including review of the retrospective medical records and patient interviews, were conducted in two cases that occurred in 2012. To identify the vectors and pathogens, ticks were collected between September 23 and October 6, 2012 from the area where the tick bite in the first patient occurred. The ticks were classified, and polymerase chain reaction (PCR) tests and cultures were performed.
Results
The first patient, a 46-year-old female, visited a forest in Gangwon province, which was 900 m above sea level, where the tick bite occurred. Two weeks after the tick bite, erythema migrans (12 × 6 cm² in size) appeared on the site of tick bite, along with fever, chill, fatigue, myalgia, and arthralgia on shoulders, knees, and hips. The second patient, a 44-year-old male, visited a mountain in Gangwon province, which was 1200 m above sea level, where a tick bite occurred. One month after the tick bite, erythema migrans appeared at the site of the tick bite, along with fatigue, myalgia, and arthralgia on the right shoulder and temporomandibular joint. Indirect fluorescent antibody testing and Western blotting were carried out in these two cases for diagnosis, and positive findings were obtained. As a result, Lyme borreliosis could be confirmed. To estimate the pathogens and vectors, the ticks were collected. A total of 122 ticks were collected and only two species, Haemaphysalis japonica and Haemaphysalis flava, were identified. PCR and culture were performed on ticks. However, Borrelia burgdo rferi sensu lato was not isolated from any collected ticks.
Conclusions
This study is significant to confirm Lyme borreliosis officially at first by the national surveillance system, although identification of the mites and pathogens failed.

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Articles

Spatial and Temporal Distribution of Plasmodium vivax Malaria in Korea Estimated with a Hierarchical Generalized Linear Model: Maengseok Noh, Youngjo Lee, Seungyoung Oh, Chaeshin Chu, Jin Gwack, Seung-Ki Youn, Shin Hyeong Cho, Won Ja Lee, Sun Huh; Osong Public Health Res Perspect. 2012;3(4):192-198. Published online December 31, 2012; DOI: https://doi.org/10.1016/j.phrp.2012.11.003

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Objectives
The spatial and temporal correlations were estimated to determine Plasmodium vivax malarial transmission pattern in Korea from 2001–2011 with the hierarchical generalized linear model.
Methods
Malaria cases reported to the Korea Centers for Disease Control and Prevention from 2001 to 2011 were analyzed with descriptive statistics and the incidence was estimated according to age, sex, and year by the hierarchical generalized linear model. Spatial and temporal correlation was estimated and the best model was selected from nine models. Results were presented as diseases map according to age and sex.
Results
The incidence according to age was highest in the 20–25-year-old group (244.52 infections/100,000). Mean ages of infected males and females were 31.0 years and 45.3 years with incidences 7.8 infections/100,000 and 7.1 infections/100,000 after estimation. The mean month for infection was mid-July with incidence 10.4 infections/100,000. The best-fit model showed that there was a spatial and temporal correlation in the malarial transmission. Incidence was very low or negligible in areas distant from the demilitarized zone between Republic of Korea and Democratic People’s Republic of Korea (North Korea) if the 20–29-year-old male group was omitted in the diseases map.
Conclusion
Malarial transmission in a region in Korea was influenced by the incidence in adjacent regions in recent years. Since malaria in Korea mainly originates from mosquitoes from North Korea, there will be continuous decrease if there is no further outbreak in North Korea.

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Acute Health Effects Among Military Personnel Participating in the Cleanup of the Hebei Spirit Oil Spill, 2007, in Taean County, Korea: Jin Gwack, Ju Hyung Lee, Young Ah Kang, Kyu-jin Chang, Moo Sik Lee, Jee Young Hong; Osong Public Health Res Perspect. 2012;3(4):206-212. Published online December 31, 2012; DOI: https://doi.org/10.1016/j.phrp.2012.10.001

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Abstract PDF

Objectives
This study was conducted to investigate acute health effects and its related factors among military personnel participating in the cleanup of the 2007 Hebei Spirit oil spill accident in Taean county, Korea.
Methods
We collected data on acute symptoms during the cleanup and their predictors using a self-administered questionnaire to 2624 military personnel. Selfreported symptoms included six neurologic symptoms, five respiratory symptoms, two dermatologic symptoms, three ophthalmic symptoms, and three general symptoms. Independent variables were demographic factors (gender, age, education level, and rank), health behavioral factors (smoking history and usage of the personal protective equipment such as masks and gloves), and occupational history such as where and for how long individuals participated in cleanup.
Results
The duration of work days was significantly associated with 17 acute symptoms except for itchiness and red skin.Working in Taean county also increased the risk of most acute symptoms except headache and back pain. In regard to personal protective equipment, wearing masks was mainly related to the development of respiratory symptoms such as sore throat and wearing other protective equipment was related to the development of sore throat, back pain, headache, and cough. Military personnel younger than 25 years reported 4.66 times more hot flushing and 5.39 times more itchiness than those older than 25 years.
Conclusion
It should be emphasized that for early-stage cleanup the number of workers should be minimized, sufficient personal protective equipment with approved quality for blocking noxious gas should be supplied, and systematic health care for the workers should be provided. Health effects could be diminished by providing adequate education regarding the appropriate use of protective equipment, especially to nonprofessionals such as residents and volunteers. To make disaster response expeditious, a national and regional preparedness plans and a professional response team for emergency environmental assessment and emergency action should be established beforehand to make prompt decisions.

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Enteropathogenic Escherichia coli Outbreak and its Incubation Period: Is it Short or Long? [Volume 3, Issue 1, March 2012, Pages 43–47]: Dong-Woo Lee, Jin Gwack, Seung-Ki Youn; Osong Public Health Res Perspect. 2012;3(2):118-118. Published online June 30, 2012; DOI: https://doi.org/10.1016/j.phrp.2012.06.001

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Enteropathogenic Escherichia coli Outbreak and its Incubation Period: Is it Short or Long?: Dong-Woo Lee, Jin Gwack, Seun-Ki Youn; Osong Public Health Res Perspect. 2012;3(1):43-47. Published online December 31, 2011; DOI: https://doi.org/10.1016/j.phrp.2012.01.007

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Abstract PDF

Objectives
The aim of this study is to determine the incubation period of enteropathogenic Escherichia coli (EPEC), which creates several outbreaks in a year in South Korea.
Methods
We reviewed all water and food-borne outbreaks data reported to the Korea Centers for Disease Control and Prevention (KCDC) from 2009 to 2010 and determined their characteristics. Through this process, we can presume the incubation period of EPEC among outbreaks in South Korea.
Results
A total of 497 water and food-borne outbreaks were reported to KCDC and 66 (13.28%) are defined as E coli-origin outbreaks. EPEC was the most common subtype of E coli, being confirmed as a causative organism in 26 outbreaks. Overall attack rate was 15.85% (range 0.9–100). The subjects were eight outbreaks that have a clear history of single exposure and we can estimate the incubation time of EPEC as minimum 0.5 hours to maximum 34.0 hours with a mean 12.9 hours (range 4.5–24.0). The cases of those cannot completely rule out the chance of multiple exposure from same source or place have minimum 1.0 hour, to a maximum of 195.5 hours and a mean 30.5 (range 22.7–61.0) hours of incubation period.
Conclusions
This serial analysis suggests that EPEC has actually shorter mean incubation period as much as 12 hours. When this period is longer than 1 day or over, then the epidemiologic investigator should consider the chance of repeated or continuous exposure by making it clear whether there is any chance of any other exposure in common.

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Brief Report

Trends in Water- and Foodborne Disease Outbreaks in Korea, 2007–2009: Jin Gwack, Kyoung-Chan Lee, Hyo Jin Lee, Wooseok Kwak, Dong Woo Lee, Yeon Hwa Choi, Jin Seok Kim, Young Ah Kang; Osong Public Health Res Perspect. 2010;1(1):50-54. Published online December 31, 2010; DOI: https://doi.org/10.1016/j.phrp.2010.12.011

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Abstract PDF

Objectives
In Korea, every outbreak of acute gastroenteritis in two or more patients who are epidemiologically related is investigated by local public health centres to determine causative agents and control the outbreak with the support of the Korean Centers for Disease Control and Prevention. The findings and conclusions of each outbreak investigation have been summarized annually since 2007 to make reports and statistics of water- and foodborne disease outbreaks.
Methods
All outbreaks reported to Korean Centers for Disease Control and Prevention from 2007 to 2009 were included in the study. We analysed the trends and epidemiologic aspects of outbreaks by month, year, and location.
Results
The total number of outbreaks decreased steadily each year for the period the study covered, whereas the number of patients per outbreak continued to increase resulting from a dramatic increase in the number of patients per outbreak in food service establishments. The outbreaks occurred in the period of June to September, when temperature and humidity are relatively high, which accounted for 44.3% of total outbreaks. The monthly number of outbreaks decreased steadily until November after peaking in May 2009. The most common causative agent was norovirus (16.5%) followed by pathogenic Escherichia coli. The rate of causative agent identification was 60.1%, with higher identification rates in larger outbreaks.
Conclusions
Although a decreasing trend of outbreaks by year was observed in the study, the food services in schools and companies require more attention to hygiene and sanitation to prevent large outbreaks. The ability to establish the cause of an outbreak should be further improved.

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