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Brief Communications

Molecular Identification of Anisakis Larvae Extracted by Gastrointestinal Endoscopy from Health Check-up Patients in Korea
Hyemi Song, Bong-Kwang Jung, Jaeeun Cho, Taehee Chang, Sun Huh, Jong-Yil Chai
Korean J Parasitol 2019;57(2):207-211.
Published online April 30, 2019
DOI: https://doi.org/10.3347/kjp.2019.57.2.207
Anisakiasis is a zoonotic disease induced by anisakid nematodes, and endoscopic inspection is used for a diagnosis or remedy for it. Anisakis simplex, Anisakis physeteris, and Pseudoterranova decipiens had been reported to be the major species causing human infections, particularly, in Japan. However, in Korea, recent studies strongly suggested that Anisakis pegreffii is the major species of human infections. To support this suggestion, we collected anisakid larvae (n=20) from 20 human patients who were undergone gastrointestinal endoscopy at a health check-up center in Korea, and molecular identification was performed on the larvae using PCR-RFLP analysis and gene sequencing of rDNA ITS regions and mtDNA cox2. In addition, anisakid larvae (n=53) collected from the sea eel (Astroconger myriaster) were also examined for comparison with those extracted from humans. The results showed that all human samples (100%) were identified as A. pegreffii, whereas 90.7% of the samples from the sea eel were A. pegreffii with the remaining 9.3% being Hysterothylacium aduncum. Our study confirmed that A. pegreffii is the predominant species causing human anisakiasis in Korea, and this seems to be due to the predominance of this larval type in the fish (sea eels) popularly consumed by the Korean people. The possibility of human infection with H. aduncum in Korea is also suggested.

Citations

Citations to this article as recorded by  Crossref logo
  • Risk Factors of Anisakidosis at the Global Level: A Review
    Yosuke Fujisawa, Diane P. Barton, Shokoofeh Shamsi
    Current Clinical Microbiology Reports.2025;[Epub]     CrossRef
  • Alterations in immunized antigens of Anisakis pegreffii by ampicillin-induced gut microbiome changes in mice
    Myungjun Kim, Jun Ho Choi, Myung-hee Yi, Singeun Oh, Tai-Soon Yong, Ju Yeong Kim
    Parasites, Hosts and Diseases.2024; 62(3): 351.     CrossRef
  • Genetic analyses of Anisakis pegreffii (Nematoda: Anisakidae) from the East Asian finless porpoise Neophocaena asiaeorientalis sunameri (Cetacea: Phocoenidae) in Korean waters
    Sunmin Kim, Jong Yoon Jeon, Kyunglee Lee, Hyunjoo Lee, Han Chan Park, Kyung Eun Lee, Hang Lee, Sung Bin Lee, Sang Wha Kim, Se Chang Park, Seongjun Choe, Heejeong Youn
    Parasitology Research.2024;[Epub]     CrossRef
  • Phylogenetic and phylogeographic analyses of Anisakis simplex sensu stricto (Nematoda: Anisakidae) from the common minke whale in Korean waters
    Sunmin Kim, Bom Sok Lee, Seongjun Choe
    Parasites, Hosts and Diseases.2023; 61(3): 240.     CrossRef
  • Sensitivity of candling as routine method for the detection and recovery of ascaridoids in commercial fish fillets
    E. Mercken, I. Van Damme, B. Šoba, S. Vangeenberghe, A. Serradell, T. De Sterck, J. P. L. Lumain, S. Gabriël
    Scientific Reports.2022;[Epub]     CrossRef
  • Intraspecific Genetic Variation of Anisakis typica in Indian Mackerel Caught from the Gulf of Thailand, Samut Songkhram Province
    Tanawat Chaiphongpachara, Poom Adisakwattana, Nantana Suwandittakul, Daiji Endoh
    The Scientific World Journal.2022; 2022: 1.     CrossRef
  • Anisakiasis Annual Incidence and Causative Species, Japan, 2018–2019
    Hiromu Sugiyama, Mitsuko Shiroyama, Ikuyo Yamamoto, Takashi Ishikawa, Yasuyuki Morishima
    Emerging Infectious Diseases.2022; 28(10): 2105.     CrossRef
  • Identification and genetic characterization of Contracaecum sp. (Nematoda: Anisakidae) from China
    Qingxun ZHANG, Meng MENG, Chengmei HUANG, Shengyong FENG, Jie LIU, Yan TANG, Yu FAN, Guohui YUAN, Shuyi HAN, Jing LUO, Baohua ZHAO, Hongxuan HE
    Integrative Zoology.2021; 16(6): 929.     CrossRef
  • Anisakis pegreffii Extract Induces Airway Inflammation with Airway Remodeling in a Murine Model System
    Jun Ho Choi, Ju Yeong Kim, Myung-hee Yi, Myungjun Kim, Tai-Soon Yong, Kalman Imre
    BioMed Research International.2021;[Epub]     CrossRef
  • Morphological study and molecular epidemiology of Anisakis larvae in mackerel fish
    Vipavinee Cheypanya, Pheravut Wongsawad, Chalobol Wongsawad, Nattawadee Nantarat
    Asian Pacific Journal of Tropical Medicine.2021; 14(5): 214.     CrossRef
  • Presence of Anisakidae in commercial fish species imported into the Belgian food markets: A systematic review and meta-analyses
    E. Mercken, I. Van Damme, A. Serradell, S. Gabriël
    International Journal of Food Microbiology.2020; 318: 108456.     CrossRef
  • Occurrence and molecular identification of Anisakis larval type 1 (Nematoda: Anisakidae) in marketed fish in Egypt
    Eman Mostafa, Marwa Omar, Shimaa. S. Hassan, Mohamed Samir
    Journal of Parasitic Diseases.2020; 44(3): 536.     CrossRef
  • Ascaridoids in commercial fish: Occurrence, intensity and localization in whole fish and fillets destined for the Belgian market
    E. Mercken, I. Van Damme, S. Vangeenberghe, A. Serradell, T. De Sterck, J.P.L. Lumain, S. Gabriël
    International Journal of Food Microbiology.2020; 327: 108657.     CrossRef
  • Advances in Omic Studies Drive Discoveries in the Biology of Anisakid Nematodes
    Stefano D’Amelio, Fabrizio Lombardo, Antonella Pizzarelli, Ilaria Bellini, Serena Cavallero
    Genes.2020; 11(7): 801.     CrossRef
  • Status of common parasitic diseases in Korea in 2019
    Sun Huh
    Journal of the Korean Medical Association.2019; 62(8): 437.     CrossRef
  • Parasitic infections and medical expenses according to Health Insurance Review Assessment claims data in South Korea, 2011–2018
    Ju Yeong Kim, Myung-hee Yi, Tai-Soon Yong, Guilherme L. Werneck
    PLOS ONE.2019; 14(11): e0225508.     CrossRef
  • Anisakid Larvae from Anchovies in the South Coast of Korea
    Taehee Chang, Bong-Kwang Jung, Sooji Hong, Hyejoo Shin, Jeonggyu Lee, Laddawan Patarwut, Jong-Yil Chai
    The Korean Journal of Parasitology.2019; 57(6): 699.     CrossRef
  • 8,899 View
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  • 17 Web of Science
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Prevalence and Phylogenetic Analyses of Trichuris suis in Pigs in Hunan Province, Subtropical China
Lei Tan, Aibing Wang, Jing Yi, Yisong Liu, Jiayu Li, Wei Liu
Korean J Parasitol 2018;56(5):495-500.
Published online October 31, 2018
DOI: https://doi.org/10.3347/kjp.2018.56.5.495
Trichuris suis infection in pigs is ubiquitous in intensive and extensive farms, which causes potential threat to human health. The
objective
of this research was to investigate the prevalence of T. suis in pigs in Hunan province. Total 2,267 fresh fecal samples distributed in 28 pig farms from 7 different administrative regions (Hunan province) were evaluated for the existence of T. suis eggs using saturated NaCl floating method. The average infection rate of T. suis in pigs was 8.91% in Hunan province. To determine genetic variation of the gained T. suis isolates in the present study, the internal transcribed spacer (ITS) regions from nuclear ribosomal DNA (rDNA) of 7 T. suis isolates were cloned and analyzed. Nucleotide diversities were 1.0-3.5% and 0-3.8% for ITS-1 and ITS-2, respectively. Phylogenetic analyses indicated that all isolates collected in the present study and T. suis available in Genbank generated a monophyletic clade. The present investigation revealed high infection rates of T. suis in pigs in Hunan province, which shed light on making effective measures to prevent and control T. suis infection in pigs in Hunan province.

Citations

Citations to this article as recorded by  Crossref logo
  • Prevalence and molecular identification of gastrointestinal nematodes in Qinghai‐Tibetan Plateau of China
    Sitong Ai, Zhichao Zhang, Jinghan Wang, Xiaoqi Wang, Cheng Liu, Ziyuan Duan
    Veterinary Medicine and Science.2023; 9(6): 2693.     CrossRef
  • Prevalences and characteristics of Trichuris spp. infection in sheep in pastoral areas of the Tianshan, Xinjiang, China
    Lixia Wang, Guowu Zhang, Yuhang Fu, Chengcheng Ning, Zhiyuan Li, Huisheng Wang, Jinsheng Zhang, Yunxia Shang, Yaoqiang Sun, Xiaoxing Huang, Xuepeng Cai, Xianzhu Xia, Qingling Meng, Jun Qiao
    Journal of Veterinary Research.2022; 66(4): 591.     CrossRef
  • Detection of Trichuris eggs in feces and soil from giraffe (Giraffa camelopardalis) and other hoofstock enclosures under human care in the USA
    Lauren Shusterman, Antoinette E. Marsh, Priscilla H. Joyner, Greg Habing
    International Journal for Parasitology: Parasites and Wildlife.2021; 15: 208.     CrossRef
  • Foodborne Parasites Dominate Current Parasitic Infections in Hunan Province, China
    Xiaohua Liu, Mengqi Wu, Yuan Liu, Jing Li, Dongqian Yang, Liping Jiang
    Frontiers in Cellular and Infection Microbiology.2021;[Epub]     CrossRef
  • Development of a Droplet Digital PCR for Detection of Trichuriasis in Sheep
    Zhichao Yu, Zhiguo Zhao, Linjun Chen, Junyan Li, Xianghong Ju
    Journal of Parasitology.2020;[Epub]     CrossRef
  • 8,197 View
  • 103 Download
  • 5 Web of Science
  • Crossref
PCR Identification and Phylogenetic Analysis of Trichomonas gallinae from Domestic Pigeons in Guangzhou, China
Shen-Ben Qiu, Meng-Na Lv, Xi He, Ya-Biao Weng, Shang-Shu Zou, Xin-Qiu Wang, Rui-Qing Lin
Korean J Parasitol 2017;55(3):333-336.
Published online June 30, 2017
DOI: https://doi.org/10.3347/kjp.2017.55.3.333
Avian trichomoniasis caused by Trichomonas gallinae is a serious protozoan disease worldwide. The domestic pigeon (Columba livia domestica) is the main host for T. gallinae and plays an important role in the spread of the disease. Based on the internal transcribed spacers of nuclear ribosomal DNA of this parasite, a pair of primers (TgF2/TgR2) was designed and used to develop a PCR assay for the diagnosis of T. gallinae infection in domestic pigeons. This approach allowed the identification of T. gallinae, and no amplicons were produced when using DNA from other common avian pathogens. The minimum amount of DNA detectable by the specific PCR assay developed in this study was 15 pg. Clinical samples from Guangzhou, China, were examined using this PCR assay and a standard microscopy method, and their molecular characteristics were determined by phylogenetic analysis. All of the T. gallinae-positive samples detected by microscopic examination were also detected as positive by the PCR assay. Most of the samples identified as negative by microscopic examination were detected as T. gallinae positive by the PCR assay and were confirmed by sequencing. The positive samples of T. gallinae collected from Guangzhou, China, were identified as T. gallinae genotype B by sequencing and phylogenetic analyses, providing relevant data for studying the ecology and population genetic structures of trichomonads and for the prevention and control of the diseases they cause.

Citations

Citations to this article as recorded by  Crossref logo
  • Rapid and sensitive detection of Trichomonas gallinae using RAA-CRISPR-Cas12a
    Yuhan Zhou, Yaqian Chen, Xinglong Song, Zhenyu Zhong, Qingyun Guo, Shengfan Jing, Olalekan Opeyemi Ayanniyi, Zhenxiao Lu, Qingxun Zhang, Congshan Yang
    Veterinary Parasitology.2025; 334: 110412.     CrossRef
  • Recombinase-Aided Amplification Combined with Lateral Flow Dipstick for the Rapid and Sensitive Detection of Trichomonas gallinae
    Yuhan Zhou, Xinglong Song, Yaqian Chen, Zhenyu Zhong, Qingyun Guo, Shengfan Jing, Yilei Zhang, Qingxun Zhang, Congshan Yang
    Journal of Parasitology.2025;[Epub]     CrossRef
  • An Evolutionarily Conserved Laterally Acquired Toolkit Enables Microbiota Targeting by Trichomonas
    Adam J Hart, Lenshina A Mpeyako, Nick P Bailey, George Merces, Joseph Gray, Jacob Biboy, Manuel Banzhaf, Waldemar Vollmer, Robert P Hirt, Ana Carolina Junqueira
    Molecular Biology and Evolution.2025;[Epub]     CrossRef
  • Genotypic diversity and epidemiology of Trichomonas gallinae in Columbidae: Insights from a comprehensive analysis
    Yu Liu, Haiming Cai, Dingai Wang, Shenquan Liao, Nanshan Qi, Juan Li, Zhuanqiang Yan, Hanqin Shen, Siyun Fang, Minna Lv, Xuhui Lin, Yongle Song, Junjing Hu, Yibin Zhu, Xiangjie Chen, Lijun Yin, Jianfei Zhang, Yaqiong Guo, Mingfei Sun
    International Journal for Parasitology: Parasites and Wildlife.2024; 23: 100918.     CrossRef
  • Prevalence and molecular characterization of Trichomonas gallinae from pigeons in Anhui, China
    Yilei Zhang, Zhenxiao Lu, Zhenzhen Liu, Yuhan Zhou, Guodong Xiao, Ayanniyi Olalekan Opeyemi, Sihua Jin, Yongsheng Li, Tao Liu, Qiong Wu, Xingdong Sun, Qianming Xu, Qingxun Zhang, Congshan Yang
    Comparative Immunology, Microbiology and Infectious Diseases.2024; 107: 102157.     CrossRef
  • SURVEY ON THE MOST COMMON DISEASES CIRCULATING AMONG PIGEONS IN THE EASTERN PROVINCE, SAUDI ARABIA
    Mahmoud H.A.Mohamad, Adel M.Abdel Aziz
    The Journal of Animal and Plant Sciences.2023; (5): 1220.     CrossRef
  • Genetic characterization of Trichomonas gallinae (Rivolta, 1878) in companion birds in Japan and the genotypical relationship in the Asia region
    Shyun Chou, Shinichiro Hadano, Atsushi Kojima, Mario Yorisaki, Masaru Yasuda, Kazunori Ike, Toshihiro Tokiwa
    Journal of Microbiology, Immunology and Infection.2022; 55(3): 527.     CrossRef
  • A new duplex real-time PCR for simultaneous detection and differentiation of Tetratrichomonas gallinarum and Trichomonas gallinae
    Brigitte Sigrist, T. W. Cherry Ng, Sarah Albini, Nina Wolfrum
    Journal of Veterinary Diagnostic Investigation.2022; 34(4): 631.     CrossRef
  • Molecular prevalence of Tetratrichomonas gallinarum and Trichomonas gallinae in three domestic free-range poultry breeds in Anhui Province, China
    Dong-qian Chen, Xin-yu Luo, Qiao-qiao Li, Jin-chao Pan, Hen Zhang, Yue-yue Gu, Zhen-zhen Kan, Jia-min Huang, Zhui Fang, Xin-chao Liu, You-fang Gu, Wen-Chao Li
    Parasitology Research.2022; 121(10): 2841.     CrossRef
  • Prevalence and diversity of Trichomonas gallinae in meat pigeons (Columba livia) in Guangdong Province, People’s Republic of China
    Haiming Cai, Yu Liu, Yibin Zhu, Zhihong Xu, Qingfeng Zhou, Zhuanqiang Yan, Shenquan Liao, Nanshan Qi, Juan Li, Xuhui Lin, Junjing Hu, Shuilan Yu, Jianfei Zhang, Junwei Lin, Minna Lv, Mingfei Sun
    Parasitology Research.2022; 121(11): 3183.     CrossRef
  • Common bacterial, viral, and parasitic diseases in pigeons (Columba livia): A review of diagnostic and treatment strategies
    Harvey M. Santos, Ching-Yi Tsai, Gail Everette M. Catulin, Kim Chloe G. Trangia, Lemmuel L. Tayo, Hung-Jen Liu, Kuo Pin Chuang
    Veterinary Microbiology.2020; 247: 108779.     CrossRef
  • Prevalence and molecular characterization of Trichomonas gallinae from domestic pigeons in Beijing, China
    Sheng-Yong Feng, Han Chang, Fu-Huang Li, Cheng-Min Wang, Jing Luo, Hong-Xuan He
    Infection, Genetics and Evolution.2018; 65: 369.     CrossRef
  • 8,307 View
  • 169 Download
  • 13 Web of Science
  • Crossref
Molecular Characterization of Enterocytozoon bieneusi in Domestic Rabbits (Oryctolagus cuniculus) in Northeastern China
Xiao-Xuan Zhang, Jing Jiang, Ya-Nan Cai, Chun-Feng Wang, Peng Xu, Gui-Lian Yang, Quan Zhao
Korean J Parasitol 2016;54(1):81-85.
Published online February 26, 2016
DOI: https://doi.org/10.3347/kjp.2016.54.1.81
A study of 426 rabbits from 3 cities in Jilin province (Changchun City and Jilin City) and Liaoning province (Shenyang City) was conducted between May and June 2015. The overall prevalence of E. bieneusi in rabbits was 0.94% (4/426), with 0% (0/116), 1.72% (3/174), and 0.74% (1/136) in Jilin, Changchun, and Shenyang City, respectively. Only 3 farms (farm 1 and farm 3 in Changchun City, farm 8 in Shenyang City) were PCR-positive for E. bieneusi. Moreover, rabbits of more than 6 months (1.72%) had the highest E. bieneusi prevalence, followed by rabbits of 4-6 months (1.26%), 2-3 months (0.58%), and less than 1 month (0%). Analysis of ITS gene of E. bieneusi suggested that all 4 E. bieneusi isolates were genotype D, and were classified as group 1a. The present results first demonstrated the existence of zoonotic E. bieneusi in domestic rabbits in China. Effective control measures should be implemented to prevent E. bieneusi infection in domestic rabbits, other animals, and humans.

Citations

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  • Iberian wild leporidae as hosts of zoonotic enteroparasites in Mediterranean ecosystems of Southern Spain
    Laura Rego, Sabrina Castro‐Scholten, Carmen Cano, Débora Jiménez‐Martín, Pamela C. Köster, Javier Caballero‐Gómez, Begoña Bailo, Alejandro Dashti, Carolina Hernández‐Castro, David Cano‐Terriza, Fátima Vioque, Jenny G. Maloney, Mónica Santín, Ignacio Garcí
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    Rashidin Abdugheni, Li Li, Zhen-Ni Yang, Yin Huang, Bao-Zhu Fang, Vyacheslav Shurigin, Osama Abdalla Abdelshafy Mohamad, Yong-Hong Liu, Wen-Jun Li
    Microorganisms.2023; 11(8): 1897.     CrossRef
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    Edgar Baz-González, Natalia Martin-Carrillo, Katherine García-Livia, Néstor Abreu-Acosta, Pilar Foronda
    Biology.2022; 11(12): 1796.     CrossRef
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    Wei Li, Lihua Xiao
    One Health.2021; 12: 100209.     CrossRef
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    Manman Zang, Jinjin Li, Chun Tang, Songtao Ding, Wei Huang, Qizhong Qin, Handeng Liu
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    Veterinary Research Communications.2021; 45(4): 453.     CrossRef
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    BMC Veterinary Research.2020;[Epub]     CrossRef
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    Haiyan Wang, Qiang Liu, Xiumei Jiang, Ying Zhang, Aiyun Zhao, Zhaohui Cui, Dongfang Li, Meng Qi, Longxian Zhang
    Infection, Genetics and Evolution.2019; 73: 113.     CrossRef
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    Yan Zhang, Anson V. Koehler, Tao Wang, Shane R. Haydon, Robin B. Gasser
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    Parasites & Vectors.2018;[Epub]     CrossRef
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  • 113 Download
  • 17 Web of Science
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Original Articles
Molecular Characterization of Various Trichomonad Species Isolated from Humans and Related Mammals in Indonesia
Mudyawati Kamaruddin, Masaharu Tokoro, Md. Moshiur Rahman, Shunsuke Arayama, Anggi P.N. Hidayati, Din Syafruddin, Puji B.S. Asih, Hisao Yoshikawa, Ei Kawahara
Korean J Parasitol 2014;52(5):471-478.
Published online October 22, 2014
DOI: https://doi.org/10.3347/kjp.2014.52.5.471

Trichomonad species inhabit a variety of vertebrate hosts; however, their potential zoonotic transmission has not been clearly addressed, especially with regard to human infection. Twenty-one strains of trichomonads isolated from humans (5 isolates), pigs (6 isolates), rodents (6 isolates), a water buffalo (1 isolate), a cow (1 isolate), a goat (1 isolate), and a dog (1 isolate) were collected in Indonesia and molecularly characterized. The DNA sequences of the partial 18S small subunit ribosomal RNA (rRNA) gene or 5.8S rRNA gene locus with its flanking regions (internal transcribed spacer region, ITS1 and ITS2) were identified in various trichomonads; Simplicimonas sp., Hexamastix mitis, and Hypotrichomonas sp. from rodents, and Tetratrichomonas sp. and Trichomonas sp. from pigs. All of these species were not detected in humans, whereas Pentatrichomonas hominis was identified in humans, pigs, the dog, the water buffalo, the cow, and the goat. Even when using the high-resolution gene locus of the ITS regions, all P. hominis strains were genetically identical; thus zoonotic transmission between humans and these closely related mammals may be occurring in the area investigated. The detection of Simplicimonas sp. in rodents (Rattus exulans) and P. hominis in water buffalo in this study revealed newly recognized host adaptations and suggested the existence of remaining unrevealed ranges of hosts in the trichomonad species.

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  • 18S rRNA gene metabarcoding for investigation of gastrointestinal parasite diversity in great cormorants
    Subin Lee, Badriah Alkathiri, Chang Hyeon Lee, Heon Woo Lee, Dong-Hyuk Jeong, Ju Yeong Kim, Seongjun Choe, Seung-Hun Lee
    Scientific Reports.2025;[Epub]     CrossRef
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    Yuangang Yang, Wei Luo, Peng Luo, Mingkun He, Feng Jiang, Jianli Xiong, Zhangqiang You
    Zoologia (Curitiba).2025;[Epub]     CrossRef
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    Qing-Xin Fan, Jin-Long Wang, Yao Liang, Yu-Xuan Wang, Han-Dan Xiao, Xing-Quan Zhu, Qing Liu
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    APMIS.2025;[Epub]     CrossRef
  • Prevalence of intestinal trichomonads in captive non-human primates in China
    Ping-Ping Ma, Yang Zou, Wen-Jie Mu, Yue-Yue Zhang, Ya-Qi Li, Zhong-Li Liu, Long Zhang, Li-Xian Chen, Guo-Hua Liu, Shuai Wang
    Parasite.2024; 31: 19.     CrossRef
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    Yao Rong, Xichen Zhang, Xuejiao Chen, Jianhua Li, Pengtao Gong, Xiaocen Wang, Xin Li, Xu Zhang, Taotao Yue, Hongbo Zhang, Xiaofei Zhou, Nan Zhang
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Occurrence and Molecular Identification of Anisakis Dujardin, 1845 from Marine Fish in Southern Makassar Strait, Indonesia
Hilal Anshary, Sriwulan, Mark A. Freeman, Kazuo Ogawa
Korean J Parasitol 2014;52(1):9-19.
Published online February 19, 2014
DOI: https://doi.org/10.3347/kjp.2014.52.1.9

Anisakis spp. (Nematoda: Anisakidae) parasitize a wide range of marine animals, mammals serving as the definitive host and different fish species as intermediate or paratenic hosts. In this study, 18 fish species were investigated for Anisakis infection. Katsuwonus pelamis, Euthynnus affinis, Caranx sp., and Auxis thazard were infected with high prevalence of Anisakis type I, while Cephalopholis cyanostigma and Rastrelliger kanagurta revealed low prevalence. The mean intensity of Anisakis larvae in K. pelamis and A. thazard was 49.7 and 5.6, respectively. A total of 73 Anisakis type I larvae collected from K. pelamis and A. thazard were all identified as Anisakis typica by PCR-RFLP analysis. Five specimens of Anisakis from K. pelamis and 15 specimens from A. thazard were sequenced using ITS1-5.8S-ITS2 region and 6 specimens from A. thazard and 4 specimens from K. pelamis were sequenced in mtDNA cox2 region. Alignments of the samples in the ITS region showed 2 patterns of nucleotides. The first pattern (genotype) of Anisakis from A. thazard had 100% similarity with adult A. typica from dolphins from USA, whereas the second genotype from A. thazard and K. pelamis had 4 base pairs different in ITS1 region with adult A. typica from USA. In the mtDNA cox2 regions, Anisakis type I specimens from A. thazard and K. pelamis showed similarity range from 94% to 99% with A. typica AB517571/DQ116427. The difference of 4 bp nucleotides in ITS1 regions and divergence into 2 subgroups in mtDNA cox2 indicating the existence of A. typica sibling species in the Makassar Strait.

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Molecular Variation in the Paragonimus heterotremus Complex in Thailand and Myanmar
Oranuch Sanpool, Pewpan M. Intapan, Tongjit Thanchomnang, Penchom Janwan, Yukifumi Nawa, David Blair, Wanchai Maleewong
Korean J Parasitol 2013;51(6):677-681.
Published online December 31, 2013
DOI: https://doi.org/10.3347/kjp.2013.51.6.677

Paragonimiasis is an important food-borne parasitic zoonosis caused by infection with lung flukes of the genus Paragonimus. Of the 7 members of the genus known in Thailand until recently, only P. heterotremus has been confirmed as causing human disease. An 8th species, P. pseudoheterotremus, has recently been proposed from Thailand, and has been found in humans. Molecular data place this species as a sister species to P. heterotremus, and it is likely that P. pseudoheterotremus is not specifically distinct from P. heterotremus. In this study, we collected metacercariae of both nominal species (identification based on metacercarial morphology) from freshwater crabs from Phetchabun Province in northern Thailand, Saraburi Province in central Thailand, and Surat Thani Province in southern Thailand. In addition, we purchased freshwater crabs imported from Myanmar at Myawaddy Province, western Thailand, close to the Myanmar-Thailand border. The DNAs extracted from excysted metacercariae were PCR-amplified and sequenced for ITS2 and cox1 genes. The ITS2 sequences were nearly identical among all samples (99-100%). Phylogenies inferred from all available partial cox1 sequences contained several clusters. Sequences from Indian P. heterotremus formed a sister group to sequences from P. pseudoheterotremus-type metacercariae. Sequences of P. heterotremus from Thailand, Vietnam, and China formed a separate distinct clade. One metacercaria from Phitsanulok Province was distinct from all others. There is clearly considerable genetic variation in the P. heterotremus complex in Thailand and the form referred to as P. pseudoheterotremus is widely distributed in Thailand and the Thai-Myanmar border region.

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