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Opisthorchis viverrini

Chinh Dang Van, Galayanee Doungchawee, Sutas Suttiprapa, Yuji Arimatsu, Sasithorn Kaewkes, Banchob Sripa
Opisthorchiasis caused by Opisthorchis viverrini is an important foodborne trematodiasis in Thailand, Laos and Cambodia. Interestingly, the opisthorchiasis endemic region overlaps with an area of leptospirosis emergence. Here we report an association between opisthorchiasis and leptospirosis in Thailand. Of 280 sera collected from villagers living around the Lawa wetland complex in Khon Kaen province, 199 (71%) were seropositive for leptospirosis by immunochromatography. Individuals with O. viverrini infection had a significantly higher rate of leptospirosis than those without (P=0...
October 13, 2016: Parasitology International
Chamraj Kaewraemruaen, Rasana W Sermswan, Surasakdi Wongratanacheewin
Opisthorchis viverrini, a human liver fluke, is still an endemic parasitic infection in Thailand and nearly all countries in Southeast Asia. O. viverrini induces a chronic stage of infection in hamsters. During the first 2 weeks of infection, Th1 inducing cytokine, IL-12, increased but was down regulated in chronic infection. In this study it was found that unmethylated-CpG ODN (oligodeoxynucleotides) 1826 increased hamster mononuclear cell proliferation and stimulated IFN-γ production in vitro. The IFN-γ levels in hamster sera were significantly increased in hamsters injected with CpG ODN 1826 alone or plus crude somatic antigens (CSAg)...
October 11, 2016: Acta Tropica
Shuohan Zheng, Yuan Zhu, Zijun Zhao, Zhongdao Wu, Kamolnetr Okanurak, Zhiyue Lv
Parasites are significant groups for carcinogenesis among which liver flukes, including Opisthorchis viverrini and Clonorchis sinensis, are typical representatives causing cholangiocarcinoma (CCA), the second most common primary hepatic malignancy with dismal prognosis. O. viverrini is prevalent in Southeast Asia, infecting 10 million people while C. sinensis has a wider distribution in East Asia and several Southeast Asian countries, affecting more than 35 million people's health. These two worms have some common characteristics and/or discrepancies in life cycle, genome, and transcriptome...
October 8, 2016: Parasitology Research
C Nithikathkul, A Trevanich, T Wongsaroj, C Wongsawad, P Reungsang
At the beginning of the new millennium, helminth infections continue to be prevalent, particularly among impoverished populations. This study attempts to create the first health informatics model of helminthiasis in Thailand. The authors investigate how a health informatics model could be used to predict the control and eradication in a national control campaign. Fish-borne helminthiasis caused by Opisthorchis viverrini remains a major public health problem in many parts of South-East Asia, including Thailand, Lao PDR, Vietnam and Cambodia...
September 26, 2016: Journal of Helminthology
Natnapa Padchasuwan, Soraya J Kaewpitoon, Ratana Rujirakul, Parichart Wakkuwattapong, Jun Norkaew, Jirawoot Kujapun, Sukanya Ponphimai, Wasugree Chavenkun, Pontip Kompor, Natthawut Kaewpitoon
The liver fluke Opisthorchis viverrini is a serious health problem in Thailand. Infection is associated with cholangiocarcinoma (CCA), endemic among human populations in northeast and north Thailand where raw fish containing fluke metacercariae are frequently consumed. Recently, Thailand public health authorities have been organized to reduce morbidity and mortality particularly in the northeast through O. viverrini and CCA screening projects. Health modfication is one of activities included in this campaign, but systemic guidelines of modifying and developing health behavior for liver flukes and CCA prevention in communities towards health belief and social support theory are still various and unclear...
2016: Asian Pacific Journal of Cancer Prevention: APJCP
Piya Sereerak, Songkaid Upontain, Prasarn Tangkawattana, Frank F Mallory, Banchob Sripa, Sirikachorn Tangkawattana
Opisthorchiasis caused by Opisthorchis viverrini is a major food-borne zoonosis in Greater Mekong sub-region. Even though campaigns discouraging the consumption of raw fish have been launched to public, the disease still remains highly endemic. The unsuccessful eradication of the disease is probably because of the persistence of the parasite in animal reservoir hosts, particularly felids. Praziquantel (PZQ) is the drug of choice for morbidity control of opisthorchiasis in humans and animals. However, there is no specific study on its dosage regimen for feline opisthorchiasis...
August 26, 2016: Parasitology International
Wilawan Pumidonming, Doaa Salman, Dulyatad Gronsang, Abdelbaset E Abdelbaset, Khamphon Sangkaeo, Shin-Ichiro Kawazu, Makoto Igarashi
Gastrointestinal zoonotic helminths of dogs and cats have a public health concern worldwide. We investigated the prevalence of gastrointestinal helminths of zoonotic significance in dogs and cats in lower Northern Thailand and utilized molecular tools for species identification of hookworms and Opisthorchis viverrini. Fecal samples of 197 dogs and 180 cats were collected. Overall prevalence of infection using microscopy was 40.1% in dogs and 33.9% in cats. Helminth infection found in both dogs and cats included hookworms, Spirometra spp...
August 27, 2016: Journal of Veterinary Medical Science
C Kaewraemruaen, R W Sermswan, S Wongratanacheewin
Opisthorchis viverrini causes public health problems in South-East Asia. Recently, TGF-β and IL-10 have been reported to increase in O. viverrini-infected hamsters but the sources of these cytokines are still unknown. In this study, the CD4(+) T cells in infected hamsters were investigated. It was demonstrated that IL-4(+) CD4(+) T cells were significantly increased in hamster spleens and mesenteric lymph nodes (MLNs) during chronic infection. Interestingly, IL-10(+) CD4(+) T cells were also discovered at a significant level while Treg (T regulatory)-like TGF- β(+) CD4(+) T cells were in MLNs of infected hamsters...
August 23, 2016: Parasite Immunology
Somphou Sayasone, Peter Odermatt, Youthanavanh Vonghachack, Syda Xayavong, Kanpaseuth Senggnam, Urs Duthaler, Kongsap Akkhavong, Jan Hattendorf, Jennifer Keiser
BACKGROUND: Treatment of the liver fluke infection Opisthorchis viverrini relies exclusively on praziquantel. Tribendimidine could be an alternative treatment option. We aimed to assess the efficacy and safety of ascending single, oral doses of tribendimidine in patients with O viverrini infection. METHODS: We did two randomised, parallel-group, single-blind, dose-ranging, phase 2 trials in children (aged 8-14 years) and adults and adolescents (≥15 years) in three O viverrini endemic villages in Champasack province, southern Laos...
October 2016: Lancet Infectious Diseases
Hermann Feldmeier, Miklos Hazay, Megumi Sato, Pongvongsa Tiengkham, Futoshi Nishimoto, Hongwei Jiang, Vatsana Sopraseuth, Kazuhiko Moji
BACKGROUND: Infections with the food-borne trematode Opisthorchis viverinni are common in Southeast Asia. In Lao PDR alone, two million people are supposed to be infected. Opisthorchiasis may cause severe liver disease, eventually leading to cholangiocarcinoma. The objective of this study is to assess the eating habits, complaints, symptoms, signs and ultrasonographical findings in three different areas of Savannakhet Province. METHODS: Study participants were recruited in Lahanam village in the flood-prone lowland of, Sonkhone district, Savannakhet Province (group A); in Non Somboon village, a community located on a hilly plateau in the same district (group B); and in staff of Savannakhet Province Hospital, Savannakhet town (group C)...
2016: Tropical Medicine and Health
Urs Duthaler, Somphou Sayasone, Fiona Vanobbergen, Melissa A Penny, Peter Odermatt, Jörg Huwyler, Jennifer Keiser
Praziquantel is the only drug available for the treatment of Opisthorchis viverrini infections. Tribendimidine has emerged as a potential treatment alternative; however, its pharmacokinetic (PK) properties have not been sufficiently studied to date. Via two phase IIa dose-finding studies, 68 O. viverrini patients were treated with 25- to 600-mg doses of tribendimidine using 50- and 200-mg tablet formulations. Plasma, blood, and dried blood spots (DBS) were sampled at selected time points. The two main metabolites of tribendimidine, active deacetylated amidantel (dADT) and acetylated dADT (adADT), were analyzed in plasma, blood, and DBS...
October 2016: Antimicrobial Agents and Chemotherapy
Fiona Vanobberghen, Melissa A Penny, Urs Duthaler, Peter Odermatt, Somphou Sayasone, Jennifer Keiser, Joel Tarning
There is a pressing need for alternative treatments against the liver fluke Opisthorchis viverrini Oral tribendimidine is a promising candidate, but its population pharmacokinetic properties are unknown. Two phase IIa trials were conducted in Laos in O. viverrini-infected adults receiving single oral doses of 25 to 600 mg tribendimidine administered as different formulations in each study (study 1 used 200-mg tablets, and study 2 used 50-mg tablets). Venous whole blood, plasma, and capillary dried blood spots were sampled frequently from 68 adults, and concentrations of the tribendimidine metabolites dADT (deacetylated amidantel) and adADT (acetylated dADT) were measured...
October 2016: Antimicrobial Agents and Chemotherapy
Kern Rei Chng, Sock Hoai Chan, Amanda Hui Qi Ng, Chenhao Li, Apinya Jusakul, Denis Bertrand, Andreas Wilm, Su Pin Choo, Damien Meng Yew Tan, Kiat Hon Lim, Roy Soetinko, Choon Kiat Ong, Dan G Duda, Simona Dima, Irinel Popescu, Chaisiri Wongkham, Zhu Feng, Khay Guan Yeoh, Bin Tean Teh, Puangrat Yongvanit, Sopit Wongkham, Vajaraphongsa Bhudhisawasdi, Narong Khuntikeo, Patrick Tan, Chawalit Pairojkul, Joanne Ngeow, Niranjan Nagarajan
Cholangiocarcinoma (CCA) is the primary cancer of the bile duct system. The role of bile duct tissue microbiomes in CCA tumorigenesis is unestablished. To address this, sixty primary CCA tumors and matched normals, from both liver fluke (Opisthorchis viverrini) associated (OVa, n=28) and non-O. viverrini associated (non-OVa, n=32) cancers, were profiled using high-throughput 16S rRNA sequencing. A distinct, tissue-specific microbiome dominated by the bacterial families Dietziaceae, Pseudomonadaceae and Oxalobacteraceae was observed in bile duct tissues...
June 2016: EBioMedicine
Tong-Soo Kim, Jhang Ho Pak, Jong-Bo Kim, Young Yil Bahk
Parasitic diseases remain an unarguable public health problem in the world. Liver fluke Clonorchis sinensis is a high risk pathogenic parasitic helminth endemic predominantly in Asian countries, including Korea, China, Taiwan, Vietnam, and the far eastern part of Russia, which still actively transmitted. According to the last 8th National Survey on the Prevalence of Intestinal Parasitic Infections in 2012, C. sinensis, whose prevalence was 1.86% in general population, revealed the highest prevalence parasite among all parasite species surveyed in Korea...
July 7, 2016: BMB Reports
Thanh Thi Ha Dao, Emmanuel Nji Abatih, Thanh Thi Giang Nguyen, Ha Thi Lam Tran, Sarah Gabriël, Suzanne Smit, Phap Ngoc Le, Pierre Dorny
Following the first report of Opisthorchis viverrini infection in a domestic duck in Phu My District of Binh Dinh Province, Central Vietnam, many other cases were observed in the province. We determined the infection rate and intensity of O. viverrini infection in ducks in 4 districts of the province. A total of 178 ducks were randomly selected from 34 farms for examination of flukes in the liver and gall bladder. An infection rate of 34.3% (range 20.7-40.4% among districts) was found; the intensity of infection was 13...
June 2016: Korean Journal of Parasitology
U Thaenkham, O Phuphisut, S Nuamtanong, T Yoonuan, S Sa-Nguankiat, Y Vonghachack, V Y Belizario, D T Dung, P Dekumyoy, J Waikagul
Haplorchis taichui is an intestinal heterophyid fluke that is pathogenic to humans. It is widely distributed in Asia, with a particularly high prevalence in Indochina. Previous work revealed that the lack of gene flow between three distinct populations of Vietnamese H. taichui can be attributed to their geographic isolation with no interconnected river basins. To test the hypothesis that interconnected river basins allow gene flow between otherwise isolated populations of H. taichui, as previously demonstrated for another trematode, Opisthorchis viverrini, we compared the genetic structures of seven populations of H...
July 14, 2016: Journal of Helminthology
Jittiyawadee Sripa, Nadda Kiatsopit, Supawadee Piratae
Ko Ae Sub-district of Khueang Nai, Ubon Ratchathani Province, Thailand is located in an endemic area for Opisthorchis viverrini and other fish-borne zoonotic trematodes (FZT) infection. This study shows the status in Ko Ae Sub-district of FZT infection based on availability of intermediate hosts and necessary requirements for the transmission of FZT. A cross-sectional survey of intermediate hosts of FZT, including Bithynia siamensis goniomphalos and cyprinoid fish, was conducted from April 2013 to December 2014...
May 2016: Southeast Asian Journal of Tropical Medicine and Public Health
Kira S Zadesenets, Andrey V Polyakov, Alexey V Katokhin, Viatcheslav A Mordvinov, Nikolay B Rubtsov
Few existing studies have dealt with cytogenetics in trematodes, largely due to the attendant technical difficulty of chromosome preparation. We performed a comparative analysis of chromosomes in five opistorchiid species, including Opisthorchis felineus Rivolta, 1884, Opisthorchis viverrini Poirier, 1886, Clonorchis sinensis Cobbold, 1875, Metorchis xanthosomus Creplin 1846, and Metorchis bilis (Braun, 1790) Odening, 1962. For some of these species, no detailed morphometric description of their karyotypes has yet been published; for the karyotype of Metorchis bilis this is the first-ever description...
July 9, 2016: Parasitology International
Claudia Machicado, Luis A Marcos, Mirko Zimic
Fasciola hepatica is considered an emergent human pathogen, causing liver fibrosis or cirrhosis, conditions that are known to be direct causes of cancer. Some parasites have been categorized by WHO as carcinogenic agents such as Opisthorchis viverrini, a relative of F. hepatica. Although these two parasites are from the same class (Trematoda), the role of F. hepatica in carcinogenesis is unclear. We hypothesized that F. hepatica might share some features with O. viverrini and to be responsible to induce proliferation of host cells...
2016: SpringerPlus
Soraya J Kaewpitoon, Ratana Rujirakul, Rujirakul Wakkuwattapong, Likit Matrakool, Taweesak Tongtawee, Sukij Panpimanmas, Prasit Pengsaa, Darawan Jomkoa, Apinya Joosiri, Natthawut Kaewpitoon
Opisthorchis viverrini is still a serious problem in Northeastern and Northern Thailand. Active surveillance is required to determine updated data for further prevention and control planning. Therefore, this study aimed to examine the prevalence and risk factors for O. viverrini in three provinces, Northeastern Thailand. A cross- sectional survey was conducted during October 2015 to March 2016 at Kaeng Sanam Nang district of Nakhon Ratchasima province, Waeng Noi district of Khon Kaen province, and Khon Sawan district of Chaiyaphum province, Thailand...
2016: Asian Pacific Journal of Cancer Prevention: APJCP
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