Parasites, Hosts and Diseases

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Original Articles

Disease vector occurrence and ecological characteristics of chiggers on the chestnut white-bellied rat Niviventer fulvescens in Southwest China between 2001 and 2019: Yan-Ling Chen, Xian-Guo Guo, Wen-Yu Song, Tian-Guang Ren, Lei Zhang, Rong Fan, Cheng-Fu Zhao, Zhi-Wei Zhang, Wen-Ge Dong, Xiao-Bin Huang, Dao-Chao Jin; Parasites Hosts Dis 2023;61(3):272-281.
Published online August 21, 2023; DOI: https://doi.org/10.3347/PHD.22044

Chigger mites are the vector of scrub typhus. This study estimates the infestation status and ecological characteristics of chiggers on the chestnut white-bellied rat Niviventer fulvescens in Southwest China between 2001 and 2019. Chiggers were identified under the microscope, and infestation indices were calculated. The Preston’s log-normal model was used to fit the curve of species abundance distribution. A total of 6,557 chiggers were collected in 136 of 342 N. fulvescens rats, showing high overall infestation indices (prevalence=39.8%, mean abundance=19.2, mean intensity=48.2) and high species diversity (S=100, H’=3.0). Leptotrombidium cangjiangense, Neotrombicula japonica, and Ascoschoengastia sifanga were the three dominant chigger species (constituent ratio=42.9%; 2,736/6,384) and exhibited an aggregated distribution among different rat individuals. We identified 100 chigger species, with 3 of them (Leptotrombidium scutellare, Leptotrombidium wenense, and Leptotrombidium deliense) as the main vectors of scrub typhus in China and nine species as potential vectors of this disease. Disease vector occurrence on N. fulvescens may increase the risk of spreading scrub typhus from rats to humans. Chigger infestation on N. fulvescens varied significantly in different environments. The species abundance distribution showed a log-normal distribution pattern. The estimated number of chigger species on N. fulvescens was 126 species.

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A Report of Chigger Mites on the Striped Field Mouse, Apodemus agrarius, in Southwest China: Yan-Ling Chen, Xian-Guo Guo, Tian-Guang Ren, Lei Zhang, Rong Fan, Cheng-Fu Zhao, Zhi-Wei Zhang, Ke-Yu Mao, Xiao-Bin Huang, Ti-Jun Qian; Korean J Parasitol 2021;59(6):625-634.
Published online December 22, 2021; DOI: https://doi.org/10.3347/kjp.2021.59.6.625

Abstract
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Based on the field investigations in 91 investigation sites (counties) in southwest China between 2001 and 2019, the present paper reported the chigger mites on A. agrarius mice in southwest China for the first time by using a series of statistical methods. From 715 striped field mice captured in 28 of 91 investigated sites, only 255 chiggers were collected, and they were identified as 14 species, 6 genera in 3 subfamilies under 2 families. Of 715 A. agrarius mice, only 24 of them were infested with chigger mites with low overall prevalence (P_M=3.4%), overall mean abundance (M_A=0.36 mites/host) and overall mean intensity (M_I=10.63 mites/host). The species diversity and infestation of chiggers on A. agrarius were much lower than those previously reported on some other rodents in southwest China. On a certain species of rodent, A. agrarius mouse in southwest China seems to have a very low susceptibility to chigger infestations than in other geographical regions. Of 14 chigger species, there were 3 dominant species, Leptotrombidium sialkotense, L. rupestre and Schoengastiella novoconfuciana, which were of aggregated distribution among different individuals of A. agrarius hosts. L. sialkotense, one of 6 main vectors of scrub typhus in China, was the first dominant on A. agrarius. The species similarity of chigger mites on male and female hosts was low with C_SS=0.25, and this reflects the sex-bias of different genders of A. agrarius mice in harboring different chigger species.

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Infestation, community structure, seasonal fluctuation and climate-driven dynamics of mites on small mammals at a focus of scrub typhus in southwest China
Peng-Wu Yin, Yan Lv, Xian-Guo Guo, Wen-Yu Song, Rong Fan, Cheng-Fu Zhao, Zhi-Wei Zhang, Ya-Fei Zhao, Wen-Ge Dong, Dao-Chao Jin
Frontiers in Veterinary Science.2025;[Epub] CrossRef
The Distribution and Host-Association of the Vector Chigger Species Leptotrombidium imphalum in Southwest China
Qiao-Yi Liu, Rong Fan, Wen-Yu Song, Pei-Ying Peng, Ya-Fei Zhao, Dao-Chao Jin, Xian-Guo Guo
Insects.2024; 15(7): 504. CrossRef
Clinical and epidemiological investigation of human infection with zoonotic parasite Trypanosoma dionisii in China
Nannan Xu, Xiaoai Zhang, Hui Liu, Yintao Xu, Huixia Lu, Lianhui Zhao, Yishan He, Meiqi Zhang, Jingtao Zhang, Guangqian Si, Ziyi Wang, Muxin Chen, Yuchun Cai, Yi Zhang, Qiang Wang, Yuwan Hao, Yuanyuan Li, Zhengbin Zhou, Yunhai Guo, Caiyun Chang, Ming Liu,
Journal of Infection.2024; 89(5): 106290. CrossRef
A Retrospective Report on the Infestation and Distribution of Chiggers on an Endemic Rodent Species (Apodemus latronum) in Southwest China
Qiao-Yi Liu, Xian-Guo Guo, Rong Fan, Wen-Yu Song, Pei-Ying Peng, Ya-Fei Zhao, Dao-Chao Jin
Veterinary Sciences.2024; 11(11): 547. CrossRef
Disease vector occurrence and ecological characteristics of chiggers on the chestnut white-bellied rat Niviventer fulvescens in Southwest China between 2001 and 2019
Yan-Ling Chen, Xian-Guo Guo, Wen-Yu Song, Tian-Guang Ren, Lei Zhang, Rong Fan, Cheng-Fu Zhao, Zhi-Wei Zhang, Wen-Ge Dong, Xiao-Bin Huang, Dao-Chao Jin
Parasites, Hosts and Diseases.2023; 61(3): 272. CrossRef
Infestation of Oriental House Rat (Rattus tanezumi) with Chigger Mites Varies along Environmental Gradients across Five Provincial Regions of Southwest China
Yan-Ling Chen, Xian-Guo Guo, Fan Ding, Yan Lv, Peng-Wu Yin, Wen-Yu Song, Cheng-Fu Zhao, Zhi-Wei Zhang, Rong Fan, Pei-Ying Peng, Bei Li, Ting Chen, Dao-Chao Jin
International Journal of Environmental Research and Public Health.2023; 20(3): 2203. CrossRef
Analysis on infestation and related ecology of chigger mites on large Chinese voles (Eothenomys miletus) in five provincial regions of Southwest China
Bei Li, Xian-Guo Guo, Tian-Guang Ren, Pei-Ying Peng, Wen-Yu Song, Yan Lv, Peng-Wu Yin, Zhe Liu, Xin-Hang Liu, Ti-Jun Qian
International Journal for Parasitology: Parasites and Wildlife.2022; 19: 169. CrossRef
Infestation and distribution of chigger mites on Confucian white-bellied rat (Niviventer confucianus) in Southwest China
Yan-Ling Chen, Xian-Guo Guo, Wen-Yu Song, Tian-Guang Ren, Lei Zhang, Rong Fan, Cheng-Fu Zhao, Zhi-Wei Zhang, Wen-Ge Dong, Xiao-Bin Huang
Biologia.2022; 78(3): 727. CrossRef

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Infestation and Related Ecology of Chigger Mites on the Asian House Rat (Rattus tanezumi) in Yunnan Province, Southwest China: Fan Ding, Wen-Li Jiang, Xian-Guo Guo, Rong Fan, Cheng-Fu Zhao, Zhi-Wei Zhang, Ke-Yu Mao, Rong Xiang; Korean J Parasitol 2021;59(4):377-392.
Published online August 18, 2021; DOI: https://doi.org/10.3347/kjp.2021.59.4.377

Abstract
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This paper is to illustrate the infestation and related ecological characteristics of chigger mites on the Asian house rat (Rattus tanezumi). A total of 17,221 chigger mites were collected from 2,761 R. tanezumi rats, and then identified as 131 species and 19 genera in 2 families. Leptotrombidium deliense, the most powerful vector of scrub typhus in China, was the first major dominant species on R. tanezumi. All the dominant mite species were of an aggregated distribution among different individuals of R. tanezumi. The species composition and infestations of chiggers on R. tanezumi varied along different geographical regions, habitats and altitudes. The species-abundance distribution of the chigger mite community was successfully fitted and the theoretical curve equation was Ŝ (R)=37e^–(0.28R)². The total chigger species on R. tanezumi were estimated to be 199 species or 234 species, and this further suggested that R. tanezumi has a great potential to harbor abundant species of chigger mites. The results of the species-plot relationship indicated that the chigger mite community on R. tanezumi in Yunnan was an uneven community with very high heterogeneity. Wide geographical regions with large host samples are recommended in the investigations of chigger mites.

Citations

Citations to this article as recorded by

Meteorological factors and normalized difference vegetation index drivers of scrub typhus incidence in Shandong Province based on a 16-year time-frequency analysis
Zhisong Ni, Shufen Li, Rui Xi, Kemeng Liang, Sihao Song, Chuanlong Cheng, Hui Zuo, Liang Lu, Xiujun Li
BMC Public Health.2025;[Epub] CrossRef
Mite Infestation on Rattus tanezum rats in southwest China concerning risk models
Ru-Jin Liu, Xian-Guo Guo, Pei-Ying Peng, Yan Lv, Peng-Wu Yin, Wen-Yu Song, Rong Xiang, Yan-Ling Chen, Bei Li, Dao-Chao Jin
Frontiers in Veterinary Science.2025;[Epub] CrossRef
Abundance and Infestation of Mites on Bower’s White-Toothed Rat (Berylmys bowersi) in Southwest China
Chenxi Liu, Xianguo Guo, Yan Lv, Pengwu Yin, Wenyu Song, Peiying Peng, Rong Xiang, Yanling Chen, Bei Li
Veterinary Sciences.2025; 12(5): 426. CrossRef
The Association Between Environmental Factors and Scrub Typhus: A Review
Shu Yang, Shu Yang, Yuxiang Xie, Wenjing Duan, Yiting Cui, Ai Peng, Yisheng Zhou, Yibing Fan, Hui Li, Peng Huang
Tropical Medicine and Infectious Disease.2025; 10(6): 151. CrossRef
Variation in Small Mammal Species Composition and the Occurrence of Parasitic Mites in Two Landscapes in a Scrub Typhus Endemic Region of Western Yunnan Province, China
Yun‐Yan Luo, Jia‐Xiang Yin, Zong‐Ti Shao, Zeng‐Kan Liu, Shou‐Qin Yin, Jiang‐Li Lu, Jin‐Chun Li, Rong Wei, Alan Frederick Geater
Ecology and Evolution.2025;[Epub] CrossRef
The Distribution and Host-Association of the Vector Chigger Species Leptotrombidium imphalum in Southwest China
Qiao-Yi Liu, Rong Fan, Wen-Yu Song, Pei-Ying Peng, Ya-Fei Zhao, Dao-Chao Jin, Xian-Guo Guo
Insects.2024; 15(7): 504. CrossRef
Estimation of scrub typhus incidence and spatiotemporal multicomponent characteristics from 2016 to 2023 in Zhejiang Province, China
Haocheng Wu, Ming Xue, Chen Wu, Qinbao Lu, Zheyuan Ding, Xinyi Wang, Tianyin Fu, Ke Yang, Junfen Lin
Frontiers in Public Health.2024;[Epub] CrossRef
A Retrospective Report on the Infestation and Distribution of Chiggers on an Endemic Rodent Species (Apodemus latronum) in Southwest China
Qiao-Yi Liu, Xian-Guo Guo, Rong Fan, Wen-Yu Song, Pei-Ying Peng, Ya-Fei Zhao, Dao-Chao Jin
Veterinary Sciences.2024; 11(11): 547. CrossRef
An Ecological Survey of Chiggers (Acariformes: Trombiculidae) Associated with Small Mammals in an Epidemic Focus of Scrub Typhus on the China–Myanmar Border in Southwest China
Ru-Jin Liu, Xian-Guo Guo, Cheng-Fu Zhao, Ya-Fei Zhao, Pei-Ying Peng, Dao-Chao Jin
Insects.2024; 15(10): 812. CrossRef
Infestation of Oriental House Rat (Rattus tanezumi) with Chigger Mites Varies along Environmental Gradients across Five Provincial Regions of Southwest China
Yan-Ling Chen, Xian-Guo Guo, Fan Ding, Yan Lv, Peng-Wu Yin, Wen-Yu Song, Cheng-Fu Zhao, Zhi-Wei Zhang, Rong Fan, Pei-Ying Peng, Bei Li, Ting Chen, Dao-Chao Jin
International Journal of Environmental Research and Public Health.2023; 20(3): 2203. CrossRef
Infestation and distribution of chigger mites on Chevrieri's field mouse (Apodemus chevrieri) in Southwest China
Yan-Ling Chen, Xian-Guo Guo, Tian-Guang Ren, Lei Zhang, Rong Fan, Cheng-Fu Zhao, Zhi-Wei Zhang, Ke-Yu Mao, Xiao-Bin Huang, Ti-Jun Qian
International Journal for Parasitology: Parasites and Wildlife.2022; 17: 74. CrossRef
Infestation of chigger mites on Chinese mole shrew,Anourosorex squamipes, in Southwest China and ecological analysis
Bei Li, Xian-Guo Guo, Cheng-Fu Zhao, Zhi-Wei Zhang, Rong Fan, Pei-Ying Peng, Wen-Yu Song, Tian-Guang Ren, Lei Zhang, Ti-Jun Qian
Parasite.2022; 29: 39. CrossRef
Analysis on infestation and related ecology of chigger mites on large Chinese voles (Eothenomys miletus) in five provincial regions of Southwest China
Bei Li, Xian-Guo Guo, Tian-Guang Ren, Pei-Ying Peng, Wen-Yu Song, Yan Lv, Peng-Wu Yin, Zhe Liu, Xin-Hang Liu, Ti-Jun Qian
International Journal for Parasitology: Parasites and Wildlife.2022; 19: 169. CrossRef
Preliminary Study on Species Diversity and Community Characteristics of Gamasid Mites on Small Mammals in Three Parallel Rivers Area of China
Juan-Xiu Zhou, Xian-Guo Guo, Wen-Yu Song, Cheng-Fu Zhao, Zhi-Wei Zhang, Rong Fan, Ting Chen, Yan Lv, Peng-Wu Yin, Dao-Chao Jin
Animals.2022; 12(22): 3217. CrossRef

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Epidemiological Characteristics of Rodents and Chiggers with Orientia Tsutsugamushi in the Republic of Korea: Jung Wook Park, Dae Sung Yu, Gi Seong Lee, Jin Jong Seo, Jae Keun Chung, Jae Il Lee; Korean J Parasitol 2020;58(5):559-564.
Published online October 22, 2020; DOI: https://doi.org/10.3347/kjp.2020.58.5.559

Abstract
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A survey of rodents and chiggers associated with Orientia tsutsugamushi was conducted in a rural region of the Republic of Korea (Korea) between 2014 and 2018. Overall Apodemus agrarius 15.2% had the highest seropisitive for O. tsutsugamushi, followed by Myodes regulus 11.4%. Monthly risk factors using logistic regression analysis were not associated with O. tsutsugamushi infections in rodents. The overall prevalence rate of O. tsutsugamushi among chiggers was 0.3%. The chigger (Leptotrombidium scutellare) and monthly (October) risk factors were associated with O. tsutsugamushi human infections (P<0.05). Orientia tsutsugamushi infections are endemic in rodents in Korea and people, for example, soldiers who are active outdoors, must employ preventive measures, especially during October (P<0.05). When there are many reports of O. tsutsugamushi infections in Korea. The Boryong strain 85.7% (2/14) was the most common strain detected in chiggers, followed by the Shimokoshi 7.1% (1/14) and Karp 7.1% strains.

Citations

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Mite Infestation on Rattus tanezum rats in southwest China concerning risk models
Ru-Jin Liu, Xian-Guo Guo, Pei-Ying Peng, Yan Lv, Peng-Wu Yin, Wen-Yu Song, Rong Xiang, Yan-Ling Chen, Bei Li, Dao-Chao Jin
Frontiers in Veterinary Science.2025;[Epub] CrossRef
Geographic distribution of Orientia tsutsugamushi strains on chigger mites in the Republic of Korea (2021–2023)
Hyeon Seung Lee, Byung-Eon Noh, Hyunwoo Kim, Heeil Lee
Parasites & Vectors.2025;[Epub] CrossRef
A cross sectional study on molecular prevalence of Orientia tsutsugamushi in household rat population of South India
S. Purushothaman, P. Azhahianambi, M. Dharman, R. Gokula Kannan, K.G. Tirumurugaan, C. Soundararajan, R.P. Aravindh Babu, Panneer Devaraju, John A.J. Prakash
Comparative Immunology, Microbiology and Infectious Diseases.2024; 111: 102212. CrossRef
Orientia tsutsugamushi Infection in Wild Small Mammals in Western Yunnan Province, China
Yun-Yan Luo, Si-Tong Liu, Qi-Nan He, Ru-Dan Hong, Jun-Jie Zhu, Zhi-Qiong Ai, Jia-Xiang Yin
Pathogens.2023; 12(1): 128. CrossRef
Detection of Orientia tsutsugamushi in Novel Trombiculid Mite Species in Northern Tamil Nadu, India: Use of Targeting the Multicopy traD Gene
John Antony Jude Prakash, Kannan Kamarasu, P Philip Samuel, Renu Govindarajan, Punitha Govindasamy, Liji Anna Johnson, P Ramalingam, J Nirmalson, K C Seran, Kevin Macaluso
Journal of Medical Entomology.2022; 59(2): 693. CrossRef
Buerger’s Disease May be a Chronic Rickettsial Infection with Superimposed Thrombosis: Literature Review and Efficacy of Doxycycline in Three Patients
Moon-Hyun Chung, Jin-Soo Lee, Jae-Seung Kang
Infection & Chemotherapy.2022; 54(1): 20. 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
Geographical Distribution and Epidemiologic Factors of Chigger Mites on Apodemus agrarius during Autumn in Korea
In Yong Lee, Jae-Won Lim, Jang Hoon Seo, Heung Chul Kim, Ku Jae Lee, Tai-Soon Yong, Won-Ja Lee, Jae-Ran Yu, Seobo Sim
The Korean Journal of Parasitology.2021; 59(5): 473. CrossRef

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Relative Abundance of a Vector of Scrub Typhus, Leptotrombidium sialkotense, in Southern Yunnan Province, China: Yan Lv, Xian-Guo Guo, Dao-Chao Jin, Wen-Yu Song, Rong Fan, Cheng-Fu Zhao, Zhi-Wei Zhang, Ke-Yu Mao, Yun-Ji Zou, Zhi-Hua Yang; Korean J Parasitol 2020;58(2):153-159.
Published online April 30, 2020; DOI: https://doi.org/10.3347/kjp.2020.58.2.153

The chigger mite Leptotrombidium sialkotense is one of the 6 main vectors of scrub typhus in China. Before present study, L. sialkotense was found in some parts of Hunan province, China with a narrow geographical distribution. During field investigation 2016-2017, we found L. sialkotense in Jingha, southern Yunnan, China. Of 15 small mammal host species, L. sialkotense were collected from 6 species of the hosts. Rattus brunneusculus was a dominant host of L. sialkotense, from which 98.3% of the mites were collected. The chigger mite showed a relatively high infestation prevalence (P_M=11.7%) and mean abundance (MA=0.5) in comparison with the rest 5 host species. These results reveal a certain host specificity of L. sialkotense to a rat R. brunneusculus. The mite L. sialkotense showed an aggregated distribution on the host (P<0.05). A positive correlation observed between L. sialkotense and the body length of hosts. There was a positive interspecific association between L. sialkotense and 2 other dominant vectors, L. deliense and L. scutellare.

Citations

Citations to this article as recorded by

Abundance and Infestation of Mites on Bower’s White-Toothed Rat (Berylmys bowersi) in Southwest China
Chenxi Liu, Xianguo Guo, Yan Lv, Pengwu Yin, Wenyu Song, Peiying Peng, Rong Xiang, Yanling Chen, Bei Li
Veterinary Sciences.2025; 12(5): 426. CrossRef
Molecular Epidemiology and Genetic Diversity of Orientia tsutsugamushi From Patients and Small Mammals in Xiangyun County, Yunnan Province, China
Li Chen, Yi‐Chen Kong, Jia‐Wei Tian, Pei‐Yu Han, Song Wu, Chen‐Jie He, Ti‐Lian Ren, Bo Wang, Lian Qin, Yun‐Zhi Zhang
Veterinary Medicine and Science.2025;[Epub] CrossRef
Seasonal dynamics and niches of three vector chigger species at a focus of scrub typhus in southwest China
Yan Lv, Peng-Wu Yin, Xian-Guo Guo, Rong Fan, Cheng-Fu Zhao, Zhi-Wei Zhang, Ya-Fei Zhao, Lei Zhang
Frontiers in Veterinary Science.2025;[Epub] CrossRef
Infestation, community structure, seasonal fluctuation and climate-driven dynamics of mites on small mammals at a focus of scrub typhus in southwest China
Peng-Wu Yin, Yan Lv, Xian-Guo Guo, Wen-Yu Song, Rong Fan, Cheng-Fu Zhao, Zhi-Wei Zhang, Ya-Fei Zhao, Wen-Ge Dong, Dao-Chao Jin
Frontiers in Veterinary Science.2025;[Epub] CrossRef
The impact of meteorological parameters on the scrub typhus incidence in Baoshan City, western Yunnan, China
Yun-Yan Luo, Alan Frederick Geater, Jia-Xiang Yin
Frontiers in Public Health.2024;[Epub] CrossRef
Potential distribution of Leptotrombidium scutellare in Yunnan and Sichuan Provinces, China, and its association with mite-borne disease transmission
Wen-Yu Song, Yan Lv, Peng-Wu Yin, Yi-Yu Yang, Xian-Guo Guo
Parasites & Vectors.2023;[Epub] CrossRef
Disease vector occurrence and ecological characteristics of chiggers on the chestnut white-bellied rat Niviventer fulvescens in Southwest China between 2001 and 2019
Yan-Ling Chen, Xian-Guo Guo, Wen-Yu Song, Tian-Guang Ren, Lei Zhang, Rong Fan, Cheng-Fu Zhao, Zhi-Wei Zhang, Wen-Ge Dong, Xiao-Bin Huang, Dao-Chao Jin
Parasites, Hosts and Diseases.2023; 61(3): 272. CrossRef
Climate drives the spatiotemporal dynamics of scrub typhus in China
Fangyu Ding, Qian Wang, Mengmeng Hao, Richard James Maude, Nicholas Philip John Day, Shengjie Lai, Shuai Chen, Liqun Fang, Tian Ma, Canjun Zheng, Dong Jiang
Global Change Biology.2022; 28(22): 6618. CrossRef
Infestation and distribution of chigger mites on Confucian white-bellied rat (Niviventer confucianus) in Southwest China
Yan-Ling Chen, Xian-Guo Guo, Wen-Yu Song, Tian-Guang Ren, Lei Zhang, Rong Fan, Cheng-Fu Zhao, Zhi-Wei Zhang, Wen-Ge Dong, Xiao-Bin Huang
Biologia.2022; 78(3): 727. CrossRef
A dataset of distribution and diversity of blood-sucking mites in China
Fan-Fei Meng, Qiang Xu, Jin-Jin Chen, Yang Ji, Wen-Hui Zhang, Zheng-Wei Fan, Guo-Ping Zhao, Bao-Gui Jiang, Tao-Xing Shi, Li-Qun Fang, Wei Liu
Scientific Data.2021;[Epub] CrossRef
Infestation and Related Ecology of Chigger Mites on the Asian House Rat (Rattus tanezumi) in Yunnan Province, Southwest China
Fan Ding, Wen-Li Jiang, Xian-Guo Guo, Rong Fan, Cheng-Fu Zhao, Zhi-Wei Zhang, Ke-Yu Mao, Rong Xiang
The Korean Journal of Parasitology.2021; 59(4): 377. CrossRef
A Report of Chigger Mites on the Striped Field Mouse, Apodemus agrarius, in Southwest China
Yan-Ling Chen, Xian-Guo Guo, Tian-Guang Ren, Lei Zhang, Rong Fan, Cheng-Fu Zhao, Zhi-Wei Zhang, Ke-Yu Mao, Xiao-Bin Huang, Ti-Jun Qian
The Korean Journal of Parasitology.2021; 59(6): 625. CrossRef

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Brief Communications

Survey and Phylogenetic Analysis of Rodents and Important Rodent-Borne Zoonotic Pathogens in Gedu, Bhutan: Yoenten Phuentshok, Kezang Dorji, Tandin Zangpo, Silas A. Davidson, Ratree Takhampunya, Tenzinla Tenzinla, Chencho Dorjee, Roger S. Morris, Peter D. Jolly, Sithar Dorjee, Joanna S. McKenzie; Korean J Parasitol 2018;56(5):521-525.
Published online October 31, 2018; DOI: https://doi.org/10.3347/kjp.2018.56.5.521

Abstract
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Rodents are well-known reservoirs and vectors of many emerging and re-emerging infectious diseases, but little is known about their role in zoonotic disease transmission in Bhutan. In this study, a cross-sectional investigation of zoonotic disease pathogens in rodents was performed in Chukha district, Bhutan, where a high incidence of scrub typhus and cases of acute undifferentiated febrile illness had been reported in people during the preceding 4-6 months. Twelve rodents were trapped alive using wire-mesh traps. Following euthanasia, liver and kidney tissues were removed and tested using PCR for Orientia tsutsugamushi and other bacterial and rickettsial pathogens causing bartonellosis, borreliosis, human monocytic ehrlichiosis, human granulocytic anaplasmosis, leptospirosis, and rickettsiosis. A phylogenetic analysis was performed on all rodent species captured and pathogens detected. Four out of the 12 rodents (33.3%) tested positive by PCR for zoonotic pathogens. Anaplasma phagocytophilum, Bartonella grahamii, and B. queenslandensis were identified for the first time in Bhutan. Leptospira interrogans was also detected for the first time from rodents in Bhutan. The findings demonstrate the presence of these zoonotic pathogens in rodents in Bhutan, which may pose a risk of disease transmission to humans.

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Serena Bergamo, Giusto Trevisan, Maurizio Ruscio, Serena Bonin
Biology.2025; 14(10): 1357. CrossRef
Building a pathway to One Health surveillance and response in Asian countries
Roger Morris, Shiyong Wang
Science in One Health.2024; 3: 100067. CrossRef
Worldwide meta-analysis on Anaplasma phagocytophilum infections in animal reservoirs: Prevalence, distribution and reservoir diversity
Solomon Ngutor Karshima, Musa Isiyaku Ahmed, Kaltume Mamman Mohammed, Victoria Adamu Pam, Habiba Momoh-Abdullateef, Bulus Peter Gwimi
Veterinary Parasitology: Regional Studies and Reports.2023; 38: 100830. CrossRef
Divergent Hantavirus in Somali Shrews (Crocidura somalica) in the Semi-Arid North Rift, Kenya
Dorcus C. A. Omoga, David P. Tchouassi, Marietjie Venter, Edwin O. Ogola, Gilbert Rotich, Joseph N. Muthoni, Dickens O. Ondifu, Baldwyn Torto, Sandra Junglen, Rosemary Sang
Pathogens.2023; 12(5): 685. CrossRef
Exposure to Leptospira spp. and Associated Risk Factors in the Human, Cattle and Dog Populations in Bhutan
Anou Dreyfus, Marie-Thérèse Ruf, Anne Mayer-Scholl, Theresa Zitzl, Nadine Loosli, Nadja Seyhan Bier, Stephanie Hiereth, Sebastian Ulrich, Sven Poppert, Reinhard K. Straubinger, John Stenos, Tshokey Tshokey
Pathogens.2021; 10(3): 308. CrossRef

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Infections of Intestinal Helminth at Two Species of Field Mice, Apodemus agrarius and A. Peninsulae, in Gangwondo and Chungcheongnam-do, Korea: Jae-Hyung Lee, Shuang Gong, Yung Chul Park, Hyun-Ju Kim, In-Wook Choi, Young-Ha Lee; Korean J Parasitol 2018;56(3):301-304.
Published online June 30, 2018; DOI: https://doi.org/10.3347/kjp.2018.56.3.301

Abstract
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Rodents are important reservoirs of diseases affecting people and livestock, and are major sources of parasite contamination of agricultural products. We surveyed the infection status of intestinal helminths in 2 species of field mice, Apodemus agrarius and A. peninsulae, captured in the agricultural fields of Gangwon-do and Chungcheongnam-do, Korea. Total 83 mice (57 A. agrarius and 26 A. peninsulae) were collected in 2 surveyed areas, and the intestines of each mouse were opened with scissors, and then intestinal contents were examined with microscope. Total 6 species of intestinal helminth were detected in 61 (73.5%) out of 83 mice examined. Four species of nematode, i.e., Nippostrongylus brasiliensis, Aspiculuris tetraptera, Heterakis spp. and ascarid, were found in 40 (48.2%), 14 (16.9%), 11 (13.3%) and 13 (15.7%) mice respectively. One species of cestode, Hymenolepis diminuta and 1 unidentified egg were also detected in the intestines of 14 (16.9%) and 1 (1.2%) mice, respectively. Conclusively, this study identified 5 helminth species in the gastrointestinal tracts of wild rodents captured in some areas in central and northern Korea, and N. brasiliensis was the most prevalent (dominant) species rather than zoonotic ones.

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Metabarcoding of bacteria and parasites in the gut of Apodemus agrarius
Soo Lim Kim, Jun Ho Choi, Myung-hee Yi, Seogwon Lee, Myungjun Kim, Singeun Oh, In-Yong Lee, Bo-Young Jeon, Tai-Soon Yong, Ju Yeong Kim
Parasites & Vectors.2022;[Epub] CrossRef

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Original Articles

Chigger Mite (Acari: Trombiculidae) Survey of Rodents in Shandong Province, Northern China: Xiao-Dan Huang, Peng Cheng, Yu-Qiang Zhao, Wen-Juan Li, Jiu-Xu Zhao, Hong-Mei Liu, Jing-Xuan Kou, Mao-Qing Gong; Korean J Parasitol 2017;55(5):555-559.
Published online October 31, 2017; DOI: https://doi.org/10.3347/kjp.2017.55.5.555

Abstract
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Chigger mites are parasites of rodents and other vertebrates, invertebrates, and other arthropods, and are the only vectors of scrub typhus, in addition to other zoonoses. Therefore, investigating their distribution, diversity, and seasonal abundance is important for public health. Rodent surveillance was conducted at 6 districts in Shandong Province, northern China (114-112°E, 34-38°N), from January to December 2011. Overall, 225/286 (78.7%) rodents captured were infested with chigger mites. A total of 451 chigger mites were identified as belonging to 5 most commonly collected species and 3 genera in 1 family. Leptotrombidium scutellare and Leptotrombidium intermedia were the most commonly collected chigger mites. L. scutellare (66.2%, 36.7%, and 49.0%) was the most frequently collected chigger mite from Apodemus agrarius, Rattus norvegicus, and Microtus fortis, respectively, whereas L. intermedia (61.5% and 63.2%) was the most frequently collected chigger mite from Cricetulus triton and Mus musculus, respectively. This study demonstrated a relatively high prevalence of chigger mites that varied seasonally in Shandong Province, China.

Citations

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Spatiotemporal evolution and impacts of environment on scrub typhus in northern China, 2006–2019
Ting Li, Xianjun Wang, Yamei Wang, Chenxin Gu, Liping Yang
Journal of Global Health.2025;[Epub] CrossRef
Predicting the potential distribution areas of Leptotrombidium rubellum under current and future climate change
Qunzheng Mu, Fengfeng Li, Wenyu Li, Xiaoxia Wang, Mingyuan Tang, Kehan Chen, Yihao Jiang, Jingqi Liu, Shirong Zhang, Qiyong Liu, Chuan Wang
Frontiers in Public Health.2025;[Epub] CrossRef
Variation in Small Mammal Species Composition and the Occurrence of Parasitic Mites in Two Landscapes in a Scrub Typhus Endemic Region of Western Yunnan Province, China
Yun‐Yan Luo, Jia‐Xiang Yin, Zong‐Ti Shao, Zeng‐Kan Liu, Shou‐Qin Yin, Jiang‐Li Lu, Jin‐Chun Li, Rong Wei, Alan Frederick Geater
Ecology and Evolution.2025;[Epub] CrossRef
Explorational analysis of the abundance and prevalence of chigger and gamasid mites parasitic on small mammals in Vietnam
Anastasia A Antonovskaia, Evgeny P Altshuler, Alexander E Balakirev, Yuliya V Lopatina, Janet Foley
Journal of Medical Entomology.2024; 61(4): 925. CrossRef
Edifications on Indirect IgM ELISA and Immunofluorescence assay (IFA) of scrub typhus in humans and erudition of Orientia tsutsugamushi in the vector of cohabiting rodents
Shubham Patil, Archana Patil, Sandip Chaudhari, Shilpshri Shinde, Sunil Kolte, Waqar Khan, Nitin Kurkure
Journal of Vector Borne Diseases.2023; 60(3): 244. CrossRef
Epidemiological and clinical characteristics of scrub typhus in northern Fujian, China, from 2015 to 2019
Jin Huang, Kaixiang Deng, Jiawei Chen, Meiquan Zhang
BMC Infectious Diseases.2023;[Epub] CrossRef
Factors influencing the presence of parasitic trombiculids on red-backed voles (Myodes gapperi) in a temperate archipelago
Elyse C. Mallinger, Erik R. Olson, Geoffrey P. Vincent, Julie Van Stappen, Timothy R. Van Deelen
Canadian Journal of Zoology.2022; 100(9): 539. CrossRef
SFTSV infection in rodents and their ectoparasitic chiggers
Xiao-Lan Gu, Wen-Qing Su, Chuan-Min Zhou, Li-Zhu Fang, Ke Zhu, Dong-Qiang Ma, Fa-Chun Jiang, Ze-Min Li, Dan Li, Shu-Hui Duan, Qiu-Ming Peng, Rui Wang, Yuan Jiang, Hui-Ju Han, Xue-Jie Yu, Masayuki Saijo
PLOS Neglected Tropical Diseases.2022; 16(8): e0010698. CrossRef
Infestation and distribution of chigger mites on Confucian white-bellied rat (Niviventer confucianus) in Southwest China
Yan-Ling Chen, Xian-Guo Guo, Wen-Yu Song, Tian-Guang Ren, Lei Zhang, Rong Fan, Cheng-Fu Zhao, Zhi-Wei Zhang, Wen-Ge Dong, Xiao-Bin Huang
Biologia.2022; 78(3): 727. CrossRef
A dataset of distribution and diversity of blood-sucking mites in China
Fan-Fei Meng, Qiang Xu, Jin-Jin Chen, Yang Ji, Wen-Hui Zhang, Zheng-Wei Fan, Guo-Ping Zhao, Bao-Gui Jiang, Tao-Xing Shi, Li-Qun Fang, Wei Liu
Scientific Data.2021;[Epub] CrossRef
Infestation and Related Ecology of Chigger Mites on the Asian House Rat (Rattus tanezumi) in Yunnan Province, Southwest China
Fan Ding, Wen-Li Jiang, Xian-Guo Guo, Rong Fan, Cheng-Fu Zhao, Zhi-Wei Zhang, Ke-Yu Mao, Rong Xiang
The Korean Journal of Parasitology.2021; 59(4): 377. CrossRef
Orientia tsutsugamushi dynamics in vectors and hosts: ecology and risk factors for foci of scrub typhus transmission in northern Thailand
Ivo Elliott, Neeranuch Thangnimitchok, Kittipong Chaisiri, Tri Wangrangsimakul, Piangnet Jaiboon, Nicholas P. J. Day, Daniel H. Paris, Paul N. Newton, Serge Morand
Parasites & Vectors.2021;[Epub] CrossRef
A Report of Chigger Mites on the Striped Field Mouse, Apodemus agrarius, in Southwest China
Yan-Ling Chen, Xian-Guo Guo, Tian-Guang Ren, Lei Zhang, Rong Fan, Cheng-Fu Zhao, Zhi-Wei Zhang, Ke-Yu Mao, Xiao-Bin Huang, Ti-Jun Qian
The Korean Journal of Parasitology.2021; 59(6): 625. CrossRef
Identification of Trombiculid Chigger Mites Collected on Rodents from Southern Vietnam and Molecular Detection of Rickettsiaceae Pathogen
Minh Doan Binh, Sinh Cao Truong, Dong Le Thanh, Loi Cao Ba, Nam Le Van, Binh Do Nhu
The Korean Journal of Parasitology.2020; 58(4): 445. CrossRef
Bimonthly surveillance of wild rodents and chigger mites in urban parks in Daegu from 2018 to 2019
Yeong Bu Kim, Moon Bo Choi, Ohseok Kwon
Entomological Research.2020; 50(12): 609. CrossRef
Distribution of Orientia tsutsugamushi in rodents and mites collected from Central India
Batul Akhunji, Ruchi Bhate, Nilesh Pansare, S. P. Chaudhari, Waqar Khan, N. V. Kurkure, S. W. Kolte, S. B. Barbuddhe
Environmental Monitoring and Assessment.2019;[Epub] CrossRef
Dermoscopy confirmed Trombiculidae larva infestation in Turkey
Tamer I. Kaya, Mustafa A. Yilmaz
International Journal of Dermatology.2019;[Epub] CrossRef
Occurrence rates of wild rodent hosts and chigger mites and the infection rate ofOrientia tsutsugamushiin the central region of South Korea from 2015 to 2018
Moon Bo Choi, Yeongbu Kim, Da Young Kim, Ohseok Kwon
Entomological Research.2019; 49(8): 374. CrossRef
Analysis of epidemiological characteristics of four natural-focal diseases in Shandong Province, China in 2009-2017: A descriptive analysis
Rui Chen, Zengqiang Kou, Liuchen Xu, Jie Cao, Ziwei Liu, Xiaojing Wen, Zhiyu Wang, Hongling Wen, Isaac Chun-Hai Fung
PLOS ONE.2019; 14(8): e0221677. CrossRef

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Isolation and Characterization of Vaccine Candidate Genes Including CSP and MSP1 in Plasmodium yoelii: Seon-Hee Kim, Young-An Bae, Ju-Young Seoh, Hyun-Jong Yang; Korean J Parasitol 2017;55(3):255-265.
Published online June 30, 2017; DOI: https://doi.org/10.3347/kjp.2017.55.3.255

Malaria is an infectious disease affecting humans, which is transmitted by the bite of Anopheles mosquitoes harboring sporozoites of parasitic protozoans belonging to the genus Plasmodium. Despite past achievements to control the protozoan disease, malaria still remains a significant health threat up to now. In this study, we cloned and characterized the full-unit Plasmodium yoelii genes encoding merozoite surface protein 1 (MSP1), circumsporozoite protein (CSP), and Duffy-binding protein (DBP), each of which can be applied for investigations to obtain potent protective vaccines in the rodent malaria model, due to their specific expression patterns during the parasite life cycle. Recombinant fragments corresponding to the middle and C-terminal regions of PyMSP1 and PyCSP, respectively, displayed strong reactivity against P. yoelii-infected mice sera. Specific native antigens invoking strong humoral immune response during the primary and secondary infections of P. yoelii were also abundantly detected in experimental ICR mice. The low or negligible parasitemia observed in the secondary infected mice was likely to result from the neutralizing action of the protective antibodies. Identification of these antigenic proteins might provide the necessary information and means to characterize additional vaccine candidate antigens, selected solely on their ability to produce the protective antibodies.

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Seroepidemiological Survey of Zoonotic Diseases in Small Mammals with PCR Detection of Orientia tsutsugamushi in Chiggers, Gwangju, Korea: Jung Wook Park, Jae Keun Chung, Sun Hee Kim, Sun Ju Cho, Yi Deun Ha, So Hyang Jung, Hye Jung Park, Hyun Jae Song, Jung Yoon Lee, Dong Min Kim, Jah Pyus, Dong Ryong Ha, Eun Sun Kim, Jae Il Lee; Korean J Parasitol 2016;54(3):307-313.
Published online June 30, 2016; DOI: https://doi.org/10.3347/kjp.2016.54.3.307

Abstract
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Serosurveillance for zoonotic diseases in small mammals and detection of chiggers, the vector of Orientia tsutsugamushi, were conducted from September 2014 to August 2015 in Gwangju Metropolitan Area. Apodemus agrarius was the most commonly collected small mammals (158; 91.8%), followed by Myodes regulus (8; 4.6%), and Crocidura lasiura (6; 3.5%). The highest seroprevalence of small mammals for O. tsutsugamushi (41; 26.3%) was followed by hantaviruses (24; 15.4%), Rickettsia spp. (22; 14.1%), and Leptospira (2; 1.3%). A total of 3,194 chiggers were collected from small mammals, and 1,236 of 3,194 chiggers were identified with 7 species of 3 genera: Leptotrombidium scutellare was the most commonly collected species (585; 47.3%), followed by L. orientale (422; 34.1%), Euchoengastia koreaensis (99; 8.0%), L. palpale (58; 4.7%), L. pallidum (36; 2.9%), Neotrombicula gardellai (28; 2.3%), and L. zetum (8; 0.6%). L. scutellare was the predominant species. Three of 1,236 chigger mites were positive for O. tsutsugamushi by PCR. As a result of phylogenetic analysis, the O. tsutsugamushi strain of chigger mites had sequence homology of 90.1-98.2% with Boryong. This study provides baseline data on the distribution of zoonotic diseases and potential vectors for the development of prevention strategies of vector borne diseases in Gwangju metropolitan area.

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A Novel Strain of Orientia tsutsugamushi Detected from Chiggers (Acari: Trombiculidae) on Wild Rodents
Hak Seon Lee, Seong Yoon Kim, Hee Il Lee
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Geographic distribution of Orientia tsutsugamushi strains on chigger mites in the Republic of Korea (2021–2023)
Hyeon Seung Lee, Byung-Eon Noh, Hyunwoo Kim, Heeil Lee
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First Report on the Molecular Detection and Characterization of Rickettsia felis in Laelapidae (Acari: Mesostigmata) Mites in Malaysia
Hiryahafira Mohamad Tahir, Faraliana Che Lah Ernieenor, Suhaili Zainal Abidin, Vishalani Vishnu Narainasamy, Mariana Ahamad
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Detection of Orientia tsutsugamushi in Novel Trombiculid Mite Species in Northern Tamil Nadu, India: Use of Targeting the Multicopy traD Gene
John Antony Jude Prakash, Kannan Kamarasu, P Philip Samuel, Renu Govindarajan, Punitha Govindasamy, Liji Anna Johnson, P Ramalingam, J Nirmalson, K C Seran, Kevin Macaluso
Journal of Medical Entomology.2022; 59(2): 693. CrossRef
Emerging hantavirus infection in wild rodents captured in suburbs of Gwangju Metropolitan City, South Korea
Mi hee Seo, Choon-Mee Kim, Dong-Min Kim, Na Ra Yun, Jung Wook Park, Jae Keun Chung, Wen-Ping Guo
PLOS Neglected Tropical Diseases.2022; 16(6): e0010526. CrossRef
Orientia tsutsugamushi in Chiggers and Small Mammals in Laos
Ivo Elliott, Rawadee Kumlert, Neeranuch Thangnimitchok, Stuart D. Blacksell, Ampai Tanganuchitcharnchai, Daniel H. Paris, Paul N. Newton, Serge Morand
Vector-Borne and Zoonotic Diseases.2022; 22(10): 505. 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
First report of Borrelia burgdorferi sensu stricto detection in a commune genospecies in Apodemus agrarius in Gwangju, South Korea
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Scientific Reports.2021;[Epub] CrossRef
Epidemiological Characteristics of Rodents and Chiggers with Orientia Tsutsugamushi in the Republic of Korea
Jung Wook Park, Dae Sung Yu, Gi Seong Lee, Jin Jong Seo, Jae Keun Chung, Jae Il Lee
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Molecular Epidemiology of an Orientia tsutsugamushi Gene Encoding a 56-kDa Type-Specific Antigen in Chiggers, Small Mammals, and Patients from the Southwest Region of Korea
Jung Wook Park, Sun Hee Kim, Duck Woong Park, So Hyang Jung, Hye Jung Park, Mi Hee Seo, Hyeon Je Song, Jung Yoon Lee, Dong Min Kim, Choon-Mee Kim, Byong Chul Gill, Hang Jin Jeong, Jeong Min Lee, Dong Ryong Ha, Eun Sun Kim, Jae Keun Chung
The American Journal of Tropical Medicine and Hygiene.2018; 98(2): 616. CrossRef

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Brief Communications

Detection and Molecular Characterization of Cryptosporidium spp. from Wild Rodents and Insectivores in South Korea: Juha Song, C-Yoon Kim, Seo-Na Chang, Tamer Said Abdelkader, Juhee Han, Tae-Hyun Kim, Hanseul Oh, Ji Min Lee, Dong-Su Kim, Jong-Taek Kim, Hong-Shik Oh, Moonsuk Hur, Jae-Hwa Suh, Jae-Hak Park; Korean J Parasitol 2015;53(6):737-743.
Published online December 31, 2015; DOI: https://doi.org/10.3347/kjp.2015.53.6.737

Abstract
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In order to examine the prevalence of Cryptosporidium infection in wild rodents and insectivores of South Korea and to assess their potential role as a source of human cryptosporidiosis, a total of 199 wild rodents and insectivore specimens were collected from 10 regions of South Korea and screened for Cryptosporidium infection over a period of 2 years (2012-2013). A nested-PCR amplification of Cryptosporidium oocyst wall protein (COWP) gene fragment revealed an overall prevalence of 34.2% (68/199). The sequence analysis of 18S rRNA gene locus of Cryptosporidium was performed from the fecal and cecum samples that tested positive by COWP amplification PCR. As a result, we identified 4 species/genotypes; chipmunk genotype I, cervine genotype I, C. muris, and a new genotype which is closely related to the bear genotype. The new genotype isolated from 12 Apodemus agrarius and 2 Apodemus chejuensis was not previously identified as known species or genotype, and therefore, it is supposed to be a novel genotype. In addition, the host spectrum of Cryptosporidium was extended to A. agrarius and Crosidura lasiura, which had not been reported before. In this study, we found that the Korean wild rodents and insectivores were infected with various Cryptosporidium spp. with large intra-genotypic variationa, indicating that they may function as potential reservoirs transmitting zoonotic Cryptosporidium to livestock and humans.

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Seroprevalence of Trichinella sp. in Wild Boars (Sus scrofa) from Yanggu-gun, Gangwon-do, Korea: Hye-Jung Lee, Ok-Sik Chung, Jae-Lip Kim, Seung-Ha Lee, Young-Bok Yoo, Min Seo; Korean J Parasitol 2015;53(2):233-236.
Published online April 22, 2015; DOI: https://doi.org/10.3347/kjp.2015.53.2.233

Abstract
PDF

A total 7 outbreaks of trichinellosis have occurred in Korea, mostly as a result of consumption of raw wild boar (Sus scrofa) meat. Since only 1 serological survey on wild boars had yet been performed in Korea, the present study aimed to estimate the prevalence of trichinellosis in wild boars and some species of rodents by artificial digestion and serological examinations in Yanggu-gun, Gangwon-do, the endemic area of trichinellosis. Both the wild boar and rodent muscle samples revealed no Trichinella larvae by direct examination and artificial digestion method. However, serological examinations revealed that 4 wild boar sera samples out of 118 (3.4%) were positive to Trichinella antigen. Although the recovery of Trichinella larvae ended in a failure, it is proved for the first time that the sylvatic cycle of Trichinella has been maintained in wild boars of Gangwon-do, Korea.

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Differences in larval survival and IgG response patterns in long-lasting infections by Trichinella spiralis, Trichinella britovi and Trichinella pseudospiralis in pigs
Edoardo Pozio, Giuseppe Merialdi, Elio Licata, Giacinto Della Casa, Massimo Fabiani, Marco Amati, Simona Cherchi, Mattia Ramini, Valerio Faeti, Maria Interisano, Alessandra Ludovisi, Gianluca Rugna, Gianluca Marucci, Daniele Tonanzi, Maria Angeles Gómez-M
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Wild Boar: A Reservoir of Foodborne Zoonoses
Maria Fredriksson-Ahomaa
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A systematic review and meta-analysis on the global seroprevalence of Trichinella infection among wild boars
Ali Rostami, Seyed Mohammad Riahi, Reza Ghadimi, Hooman Hanifehpour, Faezeh Hamidi, Hooshang Khazan, H. Ray Gamble
Food Control.2018; 91: 404. CrossRef
Screening and characterization of early diagnostic antigens in excretory–secretory proteins from Trichinella spiralis intestinal infective larvae by immunoproteomics
Ruo Dan Liu, Peng Jiang, Hui Wen, Jiang Yang Duan, Li Ang Wang, Jie Feng Li, Chun Ying Liu, Ge Ge Sun, Zhong Quan Wang, Jing Cui
Parasitology Research.2016; 115(2): 615. CrossRef

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Original Articles

Susceptibility of Laboratory Rodents to Trichinella papuae: Lakkhana Sadaow, Pewpan M. Intapan, Thidarut Boonmars, Nimit Morakote, Wanchai Maleewong; Korean J Parasitol 2013;51(6):629-632.
Published online December 31, 2013; DOI: https://doi.org/10.3347/kjp.2013.51.6.629

Abstract
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Members of the genus Trichinella are small nematodes that can infect a wide range of animal hosts. However, their infectivity varies depending on the parasite and host species combination. In this study, we examined the susceptibility of 4 species of laboratory rodents, i.e., mice, rats, hamsters, and gerbils to Trichinella papuae, an emerging non-encapsulated Trichinella species. Trichinella spiralis and Trichinella pseudospiralis were also included in this study for comparison. Fifteen animals of each rodent species were infected orally with 100 muscle larvae of each Trichinella species. Intestinal worm burden was determined at day 6 and 10 post-inoculation (PI). The numbers of muscle larvae were examined at day 45 PI. The reproductive capacity index (RCI) of the 3 Trichinella species in different rodent hosts was determined. By day 6 PI, 33.2-69.6% of the inoculated larvae of the 3 Trichinella species became adult worms in the small intestines of the host animals. However, in rats, more than 96% of adult worms of all 3 Trichinella species were expelled from the gut by day 10 PI. In gerbils, only 4.8-18.1% of adult worms were expelled by day 10 PI. In accordance with the intestinal worm burden and the persistence of adults, the RCI was the highest in gerbils with values of 241.5±41.0 for T. papuae, 432.6±48 for T. pseudospiralis, and 528.6±20.6 for T. spiralis. Hamsters ranked second and mice ranked third in susceptibility in terms of the RCI, Rats yielded the lowest parasite RCI for all 3 Trichinella species. Gerbils may be an alternative laboratory animal for isolation and maintenance of Trichinella spp.

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Expressed Sequence Tag Analysis of the Erythrocytic Stage of Plasmodium berghei: Ji-Woong Seok, Yong-Seok Lee, Eun-Kyung Moon, Jung-Yub Lee, Bijay Kumar Jha, Hyun-Hee Kong, Dong-Il Chung, Yeonchul Hong; Korean J Parasitol 2011;49(3):221-228.
Published online September 30, 2011; DOI: https://doi.org/10.3347/kjp.2011.49.3.221

Abstract
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Rodent malaria parasites, such as Plasmodium berghei, are practical and useful model organisms for human malaria research because of their analogies to the human malaria in terms of structure, physiology, and life cycle. Exploiting the available genetic sequence information, we constructed a cDNA library from the erythrocytic stages of P. berghei and analyzed the expressed sequence tag (EST). A total of 10,040 ESTs were generated and assembled into 2,462 clusters. These EST clusters were compared against public protein databases and 48 putative new transcripts, most of which were hypothetical proteins with unknown function, were identified. Genes encoding ribosomal or membrane proteins and purine nucleotide phosphorylases were highly abundant clusters in P. berghei. Protein domain analyses and the Gene Ontology functional categorization revealed translation/protein folding, metabolism, protein degradation, and multiple family of variant antigens to be mainly prevalent. The presently-collected ESTs and its bioinformatic analysis will be useful resources to identify for drug target and vaccine candidates and validate gene predictions of P. berghei.

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Brief Communications

Apodemus agrarius as a new definitive host for Neodiplostomum seoulense: Jong-Yil Chai, Jae-Hwan Park, Sang-Mee Guk, Jae-Lip Kim, Hyo-Jin Kim, Won-Hee Kim, Eun-Hee Shin, Terry A. Klein, Heung-Chul Kim, Sung-Tae Chong, Jin-Won Song, Luck-Ju Baek; Korean J Parasitol 2007;45(2):157-161.
Published online June 20, 2007; DOI: https://doi.org/10.3347/kjp.2007.45.2.157

Abstract
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A total of 1,496 rodents and insectivores were live-trapped at Yeoncheon-gun (n = 351), Paju-shi (804), and Pocheon-gun (343), Gyeonggi-do (Province), and examined for intestinal helminths, including Neodiplostomum seoulense, seasonally from December 2004 to September 2005. Six species of rodents, including Apodemus agrarius (1,366), Mus musculus (32), Micronytus fortis (28), Eothenomys regulus (9), Micronys minutus (6), and Cricetulus triton (3), and 1 species of insectivores Crocidura lasiura (54) were collected. A total of 321 adult N. seoulense were collected from 19 (1.4%) A. agrarius. The worm burden ranged from 1 to 101 per A. agrarius (mean; 16.9). No N. seoulense was observed in other rodent or insectivore species examined. The infection rate during autumn (4.5%) was higher than those during spring (0.8%), summer (0.8%), and winter (0.5%). The average number of N. seoulense in infected A. agrarius was the highest in spring (66.0 specimens), followed by autumn (15.2), winter (4.5), and summer (3.3). This study first confirms that A. agrarius is a natural definitive host for N. seoulense, and demonstrates that the infection rates and intensities vary seasonally and geographically.

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Jong-Yil Chai, Jae-Hwan Park, Bong-Kwang Jung, Sang-Mee Guk, Jae-Lip Kim, Eun-Hee Shin, Terry A. Klein, Heung-Chul Kim, Sung-Tae Chong, Luck Ju Baek, Jin-Won Song
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Plagiorchis muris infection in Apodemus agrarius from northern Gyeonggi-do (Province) near the demilitarized zone: Jong-Yil Chai, Jae-Hwan Park, Sang-Mee Guk, Jae-Lip Kim, Hyo-Jin Kim, Won-Hee Kim, Eun-Hee Shin, Terry A. Klein, Heung-Chul Kim, Sung-Tae Chong, Jin-Won Song, Luck-Ju Baek; Korean J Parasitol 2007;45(2):153-156.
Published online June 20, 2007; DOI: https://doi.org/10.3347/kjp.2007.45.2.153

Abstract
PDF

The small intestines of 6 species of rodents and 1 species of insectivore were examined seasonally for Plagiorchis muris infection in 3 different localities in northern Gyeonggi-do (Province), near the demilitarized zone (DMZ). A total of 1,496 animals, including 1,366 Apodemus agrarius, 54 Crocidura lasiura (insectivore), 32 Mus musculus, 28 Micronytus fortis, 9 Eothenomys regulus, 6 Micronys minutus, and 3 Cricetulus triton, were live-trapped at Yeoncheon-gun (n = 351), Paju-shi (804) and Pocheon-gun (343) at 3-mo intervals from December 2004 to September 2005. A total of 1,647 P. muris were collected from 72 (5.3%) A. agrarius. The infection rate was the highest in Pocheon-gun (8.2%), followed by Yeoncheon-gun (5.0%) and Paju-shi (4.2%). A higher infection rate was observed in A. agrarius captured during September (19.4%) than those captured during December (3.0%), June (2.6%), or April (0%). However, the worm burden was the highest in June (av. 32.1/animal), followed by September (24.7), December (4.0), and April (0). None of the other animal species were found infected with P. muris. The results reveal that A. agrarius is a natural definitive host for P. muris, and infection rates and worm burdens vary seasonally and geographically.

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