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3 "Jong Yul Roh"
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Annual Fluctuation in Chigger Mite Populations and Orientia Tsutsugamushi Infections in Scrub Typhus Endemic Regions of South Korea
Seong Yoon Kim, Byoungchul Gill, Bong Gu Song, Hyuk Chu, Won Il Park, Hee Il Lee, E-hyun Shin, Shin-Hyeong Cho, Jong Yul Roh
Osong Public Health Res Perspect. 2019;10(6):351-358.   Published online December 31, 2019
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  • 222 Download
  • 8 Crossref
AbstractAbstract PDF

Chigger mites are vectors for scrub typhus. This study evaluated the annual fluctuations in chigger mite populations and Orientia tsutsugamushi infections in South Korea.


During 2006 and 2007, chigger mites were collected monthly from wild rodents in 4 scrub typhus endemic regions of South Korea. The chigger mites were classified based on morphological characteristics, and analyzed using nested PCR for the detection of Orientia tsutsugamushi.


During the surveillance period, the overall trapping rate for wild rodents was 10.8%. In total, 17,457 chigger mites (representing 5 genera and 15 species) were collected, and the average chigger index (representing the number of chigger mites per rodent), was 31.7. The monthly chigger index was consistently high (> 30) in Spring (March to April) and Autumn (October to November). The mite species included Leptotrombidium pallidum (43.5%), L. orientale (18.9%), L. scutellare (18.1%), L. palpale (10.6%), and L. zetum (3.6%). L. scutellare and L. palpale populations, were relatively higher in Autumn. Monthly O. tsutsugamushi infection rates in wild rodents (average: 4.8%) and chigger mites (average: 0.7%) peaked in Spring and Autumn.


The findings demonstrated a bimodal pattern of the incidence of O. tsutsugamushi infections. Higher infection rates were observed in both wild rodents and chigger mites, in Spring and Autumn. However, this did not reflect the unimodal incidence of scrub typhus in Autumn. Further studies are needed to identify factors, such as human behavior and harvesting in Autumn that may explain this discordance.


Citations to this article as recorded by  
  • Eco-epidemiology of rodent-associated trombiculid mites and infection with Orientia spp. in Southern Chile
    María Carolina Silva de la Fuente, Caricia Pérez, Constanza Martínez-Valdebenito, Ruth Pérez, Cecilia Vial, Alexandr Stekolnikov, Katia Abarca, Thomas Weitzel, Gerardo Acosta-Jamett, Jessica N. Ricaldi
    PLOS Neglected Tropical Diseases.2023; 17(1): e0011051.     CrossRef
  • Comparison of Chiggers (Acari: Trombiculidae, Leeuwenhoekiidae) on Two Sibling Mouse Species, Apodemus draco and A. ilex (Rodentia: Muridae), in Southwest China
    Yu Guo, Xian-Guo Guo, Wen-Yu Song, Yan Lv, Peng-Wu Yin, Dao-Chao Jin
    Animals.2023; 13(9): 1480.     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
  • Prevalence of chigger mites and Orientia tsutsugamushi strains in northern regions of Gangwon-do, Korea
    Soojin Kim, In Yong Lee, Sezim Monoldorova, Jiro Kim, Jang Hoon Seo, Tai-Soon Yong, Bo Young Jeon
    Parasites, Hosts and Diseases.2023; 61(3): 263.     CrossRef
  • Infestation and distribution of chiggers on the Anderson's white‐bellied rats in southwest China
    Yu Guo, Xian‐Guo Guo, Pei‐Ying Peng, Yan Lv, Rong Xiang, Wen‐Yu Song, Xiao‐Bin Huang
    Veterinary Medicine and Science.2023; 9(6): 2920.     CrossRef
  • Seroprevalence and Genotypic Characterization of Orientia tsutsugamushi in Febrile Pediatric Patients Admitted in Tertiary Care Hospital of Chennai, South India
    Rajagopal Murali, Sivasambo Kalpana, Panneerselvam Satheeshkumar, Prabu Dhandapani
    Journal of Pure and Applied Microbiology.2023; 17(4): 2232.     CrossRef
  • Infestation and seasonal fluctuation of chigger mites on the Southeast Asian house rat (Rattus brunneusculus) in southern Yunnan Province, China
    Yan Lv, Xianguo Guo, Daochao Jin, Wenyu Song, Peiying Peng, Hao Lin, Rong Fan, Chengfu Zhao, Zhiwei Zhang, Keyu Mao, Tijun Qian, Wenge Dong, Zhihua Yang
    International Journal for Parasitology: Parasites .2021; 14: 141.     CrossRef
  • Nationwide Incidence of Chigger Mite Populations and Molecular Detection of Orientia tsutsugamushi in the Republic of Korea, 2020
    Min-Goo Seo, Bong-Goo Song, Tae-Kyu Kim, Byung-Eon Noh, Hak Seon Lee, Wook-Gyo Lee, Hee Il Lee
    Microorganisms.2021; 9(8): 1563.     CrossRef
Prediction Forecast for Culex tritaeniorhynchus Populations in Korea
Nam-Hyun Kim, Wook-Gyo Lee, E-Hyun Shin, Jong Yul Roh, Hae-Chun Rhee, Mi Yeoun Park
Osong Public Health Res Perspect. 2014;5(3):131-137.   Published online June 30, 2014
  • 3,104 View
  • 28 Download
  • 3 Crossref
AbstractAbstract PDF
Japanese encephalitis is considered as a secondary legal infectious disease in Korea and is transmitted by mosquitoes in the summer season. The purpose of this study was to predict the ratio of Culex tritaeniorhynchus to all the species of mosquitoes present in the study regions.
From 1999 to 2012, black light traps were installed in 10 regions in Korea (Busan, Gyeonggi, Gangwon, Chungbuk, Chungnam, Jeonbuk, Jeonnam, Gyeongbuk, Gyeongnam, and Jeju) to capture mosquitoes for identification and classification under a dissecting microscope. The number of mosquitoes captured/week was used to calculate its daily occurrence (mosquitoes/trap/night). To predict the characteristics of the mosquito population, an autoregressive model of order p (AR(p)) was used to execute the out-of-sample prediction and the in-sample estimation after presumption.
Compared with the out-of-sample method, the sample-weighted regression method's case was relatively superior for prediction, and this method predicted a decrease in the frequency of Cx. tritaeniorhynchus for 2013. However, the actual frequency of this species showed an increase in frequency. By contrast, the frequency rate of all the mosquitoes including Cx. tritaeniorhynchus gradually decreased.
The number of patients with Japanese encephalitis has been strongly associated with the occurrence and density of vector mosquitoes, and the importance of this infectious disease has been highlighted since 2010. The 2013 prediction indicated an increase after an initial decrease, although the ratio of the two mosquito species decreased. The increase in vector density may be due to changes in temperature and the environment. Thus, continuous prevalence prediction is warranted.


Citations to this article as recorded by  
  • Joint spatiotemporal modelling reveals seasonally dynamic patterns of Japanese encephalitis vector abundance across India
    Lydia H. V. Franklinos, David W. Redding, Tim C. D. Lucas, Rory Gibb, Ibrahim Abubakar, Kate E. Jones, Andrew S. Azman
    PLOS Neglected Tropical Diseases.2022; 16(2): e0010218.     CrossRef
  • Vector competence of anthropophilic mosquitoes for a new mesonivirus in Senegal
    Alioune Gaye, Moussa Moïse Diagne, El Hadji Ndiaye, Marie Henriette Dior Ndione, Martin Faye, Cheikh Talla, Gamou Fall, Yamar Ba, Diawo Diallo, Ibrahima Dia, Pascal Handschumacher, Ousmane Faye, Amadou Alpha Sall, Mawlouth Diallo
    Emerging Microbes & Infections.2020; 9(1): 496.     CrossRef
  • The mitochondrial genomes of Culex tritaeniorhynchus and Culex pipiens pallens (Diptera: Culicidae) and comparison analysis with two other Culex species
    Qian-Chun Luo, You-Jin Hao, Fengxia Meng, Ting-Jing Li, Yi-Ran Ding, Ya-Qiong Hua, Bin Chen
    Parasites & Vectors.2016;[Epub]     CrossRef
Prevalence of Tick-Borne Encephalitis Virus in Ixodid Ticks Collected from the Republic of Korea During 2011–2012
Seok-Min Yun, Bong Gu Song, WooYoung Choi, Won Il Park, Sung Yun Kim, Jong Yul Roh, Jungsang Ryou, Young Ran Ju, Chan Park, E-Hyun Shin
Osong Public Health Res Perspect. 2012;3(4):213-221.   Published online December 31, 2012
  • 3,707 View
  • 29 Download
  • 30 Crossref
AbstractAbstract PDF
In this study, we demonstrated that TBEV-infected ticks have been distributed in the ROK, combined with our previous results. These results suggest that TBEV may exist in the ROK, and H. longicornis, H. flava, and I. nipponensis may be potential vectors of TBEV. In addition, these results emphasize the need for further epidemiological research of TBEV.
We examined for the presence of RNA of TBEV by reverse transcriptase-nested polymerase chain reaction (RT-nested PCR) using ixodid ticks captured in 25 localities of 10 provinces. Ticks were collected by the flagging and dragging method or using sentinel BG traps at forests, grass thickets, and grassland. A total of 13,053 ticks belonging to two genera and four species were collected and pooled (1292 pools), according to collection site, species of tick, and developmental stage.
Among 1292 pools, the envelope (E) protein gene of TBEV was detected using RT-nested PCR in 10 pools (3 pools of the 1,331 adult ticks and 7 pools of the 11,169 nymph ticks) collected from Gangwon-do province, Jeonrabuk-do province, and Jeju Island. The minimum infection rates for TBEV of Haemaphysalis longicornis, Haemaphysalis flava, and Ixodes nipponensis were 0.06%, 0.17%, and 2.38%, respectively. Phylogenetic analysis based on the partial E protein gene was performed to identify relationships between the TBEV strains. This showed that 10 Korean strains clustered with the Western subtype.
In this study, we investigated the prevalence of tick-borne encephalitis virus (TBEV) in ixodid ticks from various regions of the Republic of Korea (ROK) during 2011–2012 to identify whether TBEV is circulating and to determine the endemic regions of TBEV.


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    Lan-Lan Wang, Qia Cheng, Natalee D. Newton, Michael T. Wolfinger, Mahali S. Morgan, Andrii Slonchak, Alexander A. Khromykh, Tian-Yin Cheng, Rhys H. Parry
    Journal of General Virology .2024;[Epub]     CrossRef
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    Паразитология.2023; 57(5): 356.     CrossRef
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    Journal of Medical Virology.2022; 94(2): 507.     CrossRef
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    Song Joon Young
    Tick-borne encephalitis - The Book.2022;[Epub]     CrossRef
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    International Journal of Molecular Sciences.2022; 23(21): 13404.     CrossRef
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    The Korean Journal of Parasitology.2021; 59(3): 281.     CrossRef
  • Nationwide Temporal and Geographical Distribution of Tick Populations and Phylogenetic Analysis of Severe Fever with Thrombocytopenia Syndrome Virus in Ticks in Korea, 2020
    Min-Goo Seo, Byung-Eon Noh, Hak Seon Lee, Tae-Kyu Kim, Bong-Goo Song, Hee Il Lee
    Microorganisms.2021; 9(8): 1630.     CrossRef
  • Seroepidemiologic survey of emerging vector-borne infections in South Korean forest/field workers
    Ji Yun Noh, Joon Young Song, Joon Yong Bae, Man-Seong Park, Jin Gu Yoon, Hee Jin Cheong, Woo Joo Kim, Nam-Hyuk Cho
    PLOS Neglected Tropical Diseases.2021; 15(8): e0009687.     CrossRef
  • European subtype of tick-borne encephalitis virus. Literature review
    Yu. S. Savinova
    Acta Biomedica Scientifica.2021; 6(4): 100.     CrossRef
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    Andrei A. Deviatkin, Ivan S. Kholodilov, Yulia A. Vakulenko, Galina G. Karganova, Alexander N. Lukashev
    Viruses.2020; 12(2): 247.     CrossRef
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    Yuji Takahashi, Shintaro Kobayashi, Mariko Ishizuka, Minato Hirano, Memi Muto, Shoko Nishiyama, Hiroaki Kariwa, Kentaro Yoshii
    Journal of General Virology.2020; 101(5): 497.     CrossRef
  • A history of the introduction, establishment, dispersal and management ofHaemaphysalis longicornisNeumann, 1901 (Ixodida: Ixodidae) in New Zealand
    Allen C. G. Heath
    New Zealand Journal of Zoology.2020; 47(4): 241.     CrossRef
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PHRP : Osong Public Health and Research Perspectives