Molecular Identification of Trichuris suis and Trichuris trichiura Eggs in Human Populations from Thailand, Lao PDR, and Myanmar

Issarapong Phosuk Department of Parasitology, Faculty of Medicine, and Research and Diagnostic Center for Infectious Diseases, Mekong Health Science Research Institute, Khon Kaen University, Khon Kaen, Thailand;

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Oranuch Sanpool Department of Parasitology, Faculty of Medicine, and Research and Diagnostic Center for Infectious Diseases, Mekong Health Science Research Institute, Khon Kaen University, Khon Kaen, Thailand;
Faculty of Medicine, Maha Sarakram University, Maha Sarakram, Thailand;

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Tongjit Thanchomnang Faculty of Medicine, Maha Sarakram University, Maha Sarakram, Thailand;

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Lakkhana Sadaow Department of Parasitology, Faculty of Medicine, and Research and Diagnostic Center for Infectious Diseases, Mekong Health Science Research Institute, Khon Kaen University, Khon Kaen, Thailand;

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Rutchanee Rodpai Department of Parasitology, Faculty of Medicine, and Research and Diagnostic Center for Infectious Diseases, Mekong Health Science Research Institute, Khon Kaen University, Khon Kaen, Thailand;

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Witthaya Anamnart School of Public Health, Walailak University, Nakhon Si Thammarat, Thailand;

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Penchom Janwan Department of Parasitology, Faculty of Medicine, and Research and Diagnostic Center for Infectious Diseases, Mekong Health Science Research Institute, Khon Kaen University, Khon Kaen, Thailand;
School of Allied Health Sciences, Walailak University, Nakhon Si Thammarat, Thailand;

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Adulsak Wijit Office of Disease Prevention & Control 1st, Ministry of Public Health, Chiang Mai, Thailand;

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Sakhone Laymanivong Department of Parasitology, Faculty of Medicine, and Research and Diagnostic Center for Infectious Diseases, Mekong Health Science Research Institute, Khon Kaen University, Khon Kaen, Thailand;
Centre of Malariology, Parasitology and Entomology, Ministry of Health, Vientiane, Lao PDR;

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Win Pa Pa Aung Department of Parasitology, Faculty of Medicine, and Research and Diagnostic Center for Infectious Diseases, Mekong Health Science Research Institute, Khon Kaen University, Khon Kaen, Thailand;
Department of Microbiology, University of Medicine 2, Ministry of Health and Sport, Yangon, Myanmar

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Pewpan M. Intapan Department of Parasitology, Faculty of Medicine, and Research and Diagnostic Center for Infectious Diseases, Mekong Health Science Research Institute, Khon Kaen University, Khon Kaen, Thailand;

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Wanchai Maleewong Department of Parasitology, Faculty of Medicine, and Research and Diagnostic Center for Infectious Diseases, Mekong Health Science Research Institute, Khon Kaen University, Khon Kaen, Thailand;

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Trichuris trichiura is a soil-transmitted helminth infecting human populations globally. Human cases caused by Trichuris suis and Trichuris vulpis have also been reported. Molecular identifications of Trichuris species infecting human populations in Lao PDR and Myanmar are lacking. Here, we explored molecular data obtained from Trichuris eggs recovered from human fecal samples from these countries and compared these with new and existing data from Thailand. Nuclear ribosomal DNA (18S and ITS2) sequences were amplified from Trichuris eggs and sequenced. Forty-one samples showed 99–100% similarity in their 18S sequences to published sequences of T. trichiura and one sample showed 99% similarity to a sequence of T. suis. Similarly, 41 samples showed 92–100% similarity in their ITS2 sequences to published sequences of T. trichiura and one sample showed 94–97% similarity to sequences of T. suis. This study is the first molecular confirmation of human infection with T. suis in northeast Thailand and the first molecular confirmation of the species of Trichuris infecting humans in Lao PDR and Myanmar.

Author Notes

Address correspondence to Wanchai Maleewong, Faculty of Medicine, Khon Kaen University, 123 Mitraparp Road, Amphur Muang, Khon Kaen 40002, Thailand. E-mail: wanch_ma@kku.ac.th

Financial support: This study was supported by a TRF Senior Research Scholar Grant, Thailand Research Fund (T. T., P. M. I., and W. M., grant number RTA5880001); the Higher Education Research Promotion and National Research University Project of Thailand, Office of the Higher Education Commission, Thailand, through the Health Cluster (SHeP-GMS) (W. M.); the Faculty of Medicine, Khon Kaen University (W. M. and P. M. I., grant numbers TR57201 and AS58302); and Scholarship under Doctoral Training Program from Graduate School Research Affairs and Khon Kaen University (O. S., grant number 58101). I. P. was partially supported by the Faculty of Medicine, Khon Kaen University (IN 60208).

Authors’ addresses: Issarapong Phosuk, Oranuch Sanpool, Lakkhana Sadaow, Rutchanee Rodpai, Pewpan M. Intapan, and Wanchai Maleewong, Department of Parasitology, Faculty of Medicine, Khon Kaen University, Thailand, E-mails: issarapong2oum@gmail.com, sanpoolor@yahoo.com, sadaow1986@gmail.com, rutchanee5020@gmail.com, pewpan@kku.ac.th, and wanch_ma@kku.ac.th. Tongjit Thanchomnang, Faculty of Medicine, Maha Sarakram University, Maha Sarakram, Thailand, E-mail: thanchomnang@yahoo.com. Win Pa Pa Aung, Department of Microbiology, University of Medicine 2, Ministry of Health and Sport, Yangon, Myanmar, E-mail: eipamicro@gmail.com. Sakhone Laymanivong, Laboratory Unit, Centre of Malariology, Parasitology and Entomology, Ministry of Health, Vientiane, Lao PDR, E-mail: sakhone07@gmail.com. Witthaya Anamnart, School of Public Health, Walailak University, Nakhon Si Thammarat, Thailand, E-mail: awitthay@wu.ac.th. Penchom Janwan, School of Allied Health Sciences, Walailak University, Nakhon Si Thammarat, Thailand, E-mail: penchom.ja@wu.ac.th. Adulsak Wijit, Office of Disease Prevention & Control 1st, Ministry of Public Health, Chiang Mai, Thailand, E-mail: adulsak_w@hotmail.com.

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