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Wisetmora A, Wattanawong O, Wijit A, Phukowluan J, Nachairan A, Jaksuay P, Sungpradit S, Ekobol N, Boonmars T, Boonsuya A, Pechdee P, Thanchonnang C, La N, Rattanapitoon NK, Arunsan P, Rattanapitoon SK. Gastrointestinal Helminthic Infection among the Population in Northern Thailand. Acta Parasitol 2024; 69:1648-1660. [PMID: 39164545 DOI: 10.1007/s11686-024-00892-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2024] [Accepted: 07/30/2024] [Indexed: 08/22/2024]
Abstract
PURPOSE Gastrointestinal (GI) helminthic infections pose substantial public health threat, particularly in northern Thailand, with a heightened concern in Nan province. This study aims to evaluate the prevalence of GI helminthic infections in Nan province and identify associated risk factors in local population. METHODS A cross-sectional survey was conducted in 2022. Fecal specimens were collected and examined using Kato-Katz technique and Formalin Ethyl-Acetate Concentration Technique (FECT). Univariate analysis employed the Chi-square test to explore correlations, while logistic regression was defined risk factors associated with parasite infections. RESULTS Among 739 individuals surveyed, 14.34% were revealed GI helminthic infections. Notably, infection rates were higher in males (20.40%) compared to females (8.95%), with a notable prevalence among individuals aged ≥ 60 (17.78%) and high infection rate was demonstrated in Kiew Chan village (21.67%). The most commonly detected helminths were minute intestinal flukes (MIFs) (10.01%) and Capillaria spp. (3.11%). Males were significantly associated with GI helminthic infections, while individuals aged 40-49 and aged 50-59 commonly displayed of parasite infections. Additionally, Kiew Chan village exhibited a significant association with GI helminthic infections, followed by Sop Puen village. Furthermore, fecal specimens of 13 rodent specimens were frequency revealed Strongyloides spp. (92.30%) and mostly exposed Ancylostoma caninum (41.93%) among 93 canines. CONCLUSION These findings highlight the imperative for immediate public health interventions in Nan province and analogous areas in northern Thailand. Implementing strategies to enhance sanitation infrastructure and promote hygiene education can significantly contribute for reducing the prevalence of GI helminthic infections and improve overall community health.
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Affiliation(s)
- Ampas Wisetmora
- Division of Communicable Diseases, Department of Disease Control, Ministry of Public Health, Nonthaburi, 11000, Thailand
| | - Oranard Wattanawong
- Division of Communicable Diseases, Department of Disease Control, Ministry of Public Health, Nonthaburi, 11000, Thailand
| | - Adulsak Wijit
- Office of Diseases Prevention and Control 1 Chiangmai, Ministry of Public Health, Chiangmai, 50000, Thailand
| | - Jutikarn Phukowluan
- Division of Communicable Diseases, Department of Disease Control, Ministry of Public Health, Nonthaburi, 11000, Thailand
| | - Ampol Nachairan
- Division of Communicable Diseases, Department of Disease Control, Ministry of Public Health, Nonthaburi, 11000, Thailand
| | - Prueksarawuth Jaksuay
- Office of Diseases Prevention and Control 1 Chiangmai, Ministry of Public Health, Chiangmai, 50000, Thailand
| | - Sivapong Sungpradit
- Department of Pre-clinic and Applied Animal Science, Faculty of Veterinary Science, Mahidol University, Nakhonpathom, 73170, Thailand
| | - Nuttapon Ekobol
- Department of Parasitology, Faculty of Medicine, Khon Kaen University, Khon Kaen, 40002, Thailand
| | - Thidarut Boonmars
- Department of Parasitology, Faculty of Medicine, Khon Kaen University, Khon Kaen, 40002, Thailand
| | - Alisa Boonsuya
- Parasitic Disease Research Center, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand
| | - Phornphitcha Pechdee
- Parasitic Disease Research Center, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand
- Institution of Research and Development, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand
| | - Chutharat Thanchonnang
- Parasitic Disease Research Center, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand
| | - Nav La
- Parasitic Disease Research Center, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand
| | - Nathkapach K Rattanapitoon
- Parasitic Disease Research Center, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand
- FMC Medical Center, Nakhon Ratchasima, 30000, Thailand
| | - Patpicha Arunsan
- Parasitic Disease Research Center, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand
- Institution of Research and Development, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand
| | - Schawanya K Rattanapitoon
- Parasitic Disease Research Center, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand.
- Department of Family Medicine and Community Medicine, Institute of Medicine, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand.
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Suwannahitatorn P, Mungthin M, Subrungruang I, Charoensuk L, Aksorn N, Buathong S. Study of the population genetic structure of Opisthorchis-like eggs in northern Thailand using mitochondrial genes. PLoS Negl Trop Dis 2024; 18:e0012445. [PMID: 39178314 PMCID: PMC11376514 DOI: 10.1371/journal.pntd.0012445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2024] [Revised: 09/05/2024] [Accepted: 08/08/2024] [Indexed: 08/25/2024] Open
Abstract
BACKGROUND Opisthorchis-like eggs are a public health problem in northern and northeastern Thailand. However, the genetic epidemiology and structure of these parasites in northern Thailand are unknown. Thus, this study investigated their population genetic structure using cytochrome c oxidase subunit 1 (cox1) and NADH dehydrogenase subunit 1 (nad1) nucleotide sequences. METHODOLOGY/PRINCIPAL FINDINGS A study was conducted in the hill tribe regions of Chiang Mai Province, northern Thailand. Internal transcribed spacer 2 polymerase chain reaction and restriction fragment length polymorphism were used to distinguish 205 positive feces samples for Opisthorchis-like eggs. The results showed that the prevalence of O. viverrini and Haplorchis taichui was 10.5% and 38.2%, respectively, and the co-infection rate was 37.2%. To determine the genetic structure of O. viverrini and H. taichui using cox1 and nad1 genes, genetic analysis was performed using 30 randomly chosen fecal samples for Opisthorchis-like eggs. Pairwise FST analysis indicated that O. viverrini and H. taichui displayed nonsignificant genetic differentiation within Chiang Mai Province and between interpopulations from different geographic areas. Moreover, within the intrapopulation in Chiang Mai Province, cox1 presented higher gene flow than nad1 in O. viverrini, while nad1 demonstrated higher gene flow than cox1 in H. taichui. The neutrality tests based on Fu's Fs indicated population expansion and selective sweep from bottleneck or hitchhiking in O. viverrini and H. taichui populations, supported by haplotype network patterns. Phylogenetic tree analysis based on cox1 and nad1 revealed the monophyly of O. viverrini and H. taichui and genetic relationships with other isolates collected from Thailand, Lao People's Democratic Republic (PDR), and Vietnam. CONCLUSIONS/SIGNIFICANCE This study investigated the molecular discrimination and genetic structure of Opisthorchis-like eggs in northern Thailand. The genetic information derived from this study could be associated with the background, molecular epidemiology, and disease severity of these parasites.
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Affiliation(s)
- Picha Suwannahitatorn
- Department of Parasitology, Phramongkutklao College of Medicine, Ratchathewi, Bangkok, Thailand
| | - Mathirut Mungthin
- Department of Parasitology, Phramongkutklao College of Medicine, Ratchathewi, Bangkok, Thailand
| | - Ittisak Subrungruang
- Department of Clinical Pathology, Faculty of Medicine Vajira Hospital, Navamindradhiraj University, Dusit, Bangkok, Thailand
| | - Lakhanawan Charoensuk
- Department of Clinical Pathology, Faculty of Medicine Vajira Hospital, Navamindradhiraj University, Dusit, Bangkok, Thailand
| | - Nithikoon Aksorn
- Department of Clinical Pathology, Faculty of Medicine Vajira Hospital, Navamindradhiraj University, Dusit, Bangkok, Thailand
| | - Saiwasan Buathong
- Department of Clinical Pathology, Faculty of Medicine Vajira Hospital, Navamindradhiraj University, Dusit, Bangkok, Thailand
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Toledo R, Conciancic P, Fiallos E, Esteban JG, Muñoz-Antoli C. Echinostomes and Other Intestinal Trematode Infections. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2024; 1454:285-322. [PMID: 39008269 DOI: 10.1007/978-3-031-60121-7_8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/16/2024]
Abstract
Intestinal trematodes are among the most common types of parasitic worms. About 76 species belonging to 14 families have been recorded infecting humans. Infection commonly occurs when humans eat raw or undercooked foods that contain the infective metacercariae. These parasites are diverse in regard to their morphology, geographical distribution and life cycle, which make it difficult to study the parasitic diseases that they cause. Many of these intestinal trematodes have been considered as endemic parasites in the past. However, the geographical limits and the population at risk are currently expanding and changing in relation to factors such as growing international markets, improved transportation systems, new eating habits in developed countries and demographic changes. These factors make it necessary to better understand intestinal trematode infections. This chapter describes the main features of human intestinal trematodes in relation to their biology, epidemiology, host-parasite relationships, pathogenicity, clinical aspects, diagnosis, treatment and control.
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Affiliation(s)
- Rafael Toledo
- Área de Parasitología, Departamento de Farmacia, Tecnología Farmacéutica y Parasitología, Facultad de Farmacia, Universidad de Valencia, Burjassot, Valencia, Spain.
| | - Paola Conciancic
- Área de Parasitología, Departamento de Farmacia, Tecnología Farmacéutica y Parasitología, Facultad de Farmacia, Universidad de Valencia, Burjassot, Valencia, Spain
| | - Emma Fiallos
- Área de Parasitología, Departamento de Farmacia, Tecnología Farmacéutica y Parasitología, Facultad de Farmacia, Universidad de Valencia, Burjassot, Valencia, Spain
| | - J Guillermo Esteban
- Área de Parasitología, Departamento de Farmacia, Tecnología Farmacéutica y Parasitología, Facultad de Farmacia, Universidad de Valencia, Burjassot, Valencia, Spain
| | - Carla Muñoz-Antoli
- Área de Parasitología, Departamento de Farmacia, Tecnología Farmacéutica y Parasitología, Facultad de Farmacia, Universidad de Valencia, Burjassot, Valencia, Spain
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Zhao TT, Feng YJ, Doanh PN, Sayasone S, Khieu V, Nithikathkul C, Qian MB, Hao YT, Lai YS. Model-based spatial-temporal mapping of opisthorchiasis in endemic countries of Southeast Asia. eLife 2021; 10:59755. [PMID: 33432926 PMCID: PMC7870142 DOI: 10.7554/elife.59755] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2020] [Accepted: 01/11/2021] [Indexed: 12/29/2022] Open
Abstract
Opisthorchiasis is an overlooked danger to Southeast Asia. High-resolution disease risk maps are critical but have not been available for Southeast Asia. Georeferenced disease data and potential influencing factor data were collected through a systematic review of literatures and open-access databases, respectively. Bayesian spatial-temporal joint models were developed to analyze both point- and area-level disease data, within a logit regression in combination of potential influencing factors and spatial-temporal random effects. The model-based risk mapping identified areas of low, moderate, and high prevalence across the study region. Even though the overall population-adjusted estimated prevalence presented a trend down, a total of 12.39 million (95% Bayesian credible intervals [BCI]: 10.10–15.06) people were estimated to be infected with O. viverrini in 2018 in four major endemic countries (i.e., Thailand, Laos, Cambodia, and Vietnam), highlighting the public health importance of the disease in the study region. The high-resolution risk maps provide valuable information for spatial targeting of opisthorchiasis control interventions.
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Affiliation(s)
- Ting-Ting Zhao
- Department of Medical Statistics, School of Public Health, Sun Yat-sen University, Guangzhou, China
| | - Yi-Jing Feng
- Department of Medical Statistics, School of Public Health, Sun Yat-sen University, Guangzhou, China
| | - Pham Ngoc Doanh
- Department of Parasitology, Institute of Ecology and Biological Resources, Graduate University of Science and Technology, Vietnam Academy of Sciences and Technology, Cau Giay, Hanoi, Viet Nam
| | - Somphou Sayasone
- Lao Tropical and Public Health Institute, Ministry of Health, Vientiane, Lao People's Democratic Republic
| | - Virak Khieu
- National Center for Parasitology, Entomology and Malaria Control, Ministry of Health, Phnom Penh, Cambodia
| | - Choosak Nithikathkul
- Tropical and Parasitic Diseases Research Unit, Faculty of Medicine, Mahasarakham University, Mahasarakham, Thailand
| | - Men-Bao Qian
- National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention, Shanghai, China.,WHO Collaborating Centre for Tropical Diseases, Key Laboratory of Parasite and Vector Biology, Ministry of Health, Shanghai, China
| | - Yuan-Tao Hao
- Department of Medical Statistics, School of Public Health, Sun Yat-sen University, Guangzhou, China.,Sun Yat-sen Global Health Institute, Sun Yat-sen University, Guangzhou, China
| | - Ying-Si Lai
- Department of Medical Statistics, School of Public Health, Sun Yat-sen University, Guangzhou, China.,Sun Yat-sen Global Health Institute, Sun Yat-sen University, Guangzhou, China
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Buathong S, Phaiphilai K, Ruang-areerate T, Sitthichot N, Thita T, Mungthin M, Suwannahitatorn P. Genetic Differentiation of Opisthorchis-Like Eggs in Northern Thailand Using Stool Specimens Under National Strategic Plan to Control Liver Fluke Infection and Cholangiocarcinoma. Am J Trop Med Hyg 2020; 103:1118-1124. [PMID: 32588808 PMCID: PMC7470534 DOI: 10.4269/ajtmh.20-0231] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 05/20/2020] [Indexed: 12/31/2022] Open
Abstract
Liver fluke infection caused by Opisthorchis viverrini is recognized as a potential risk factor for cholangiocarcinoma (CCA). The National Strategic Plan to Control Liver Fluke Infection and Cholangiocarcinoma has implemented microscopic-based stool examination screening. However, eggs of O. viverrini and minute intestinal flukes (MIFs) are nearly morphologically similar and could result in inaccurate O. viverrini diagnosis. Stool specimens were collected from eight districts of Chiang Mai Province in northern Thailand. Opisthorchis-like eggs were identified with the Kato-Katz technique and differentiated for O. viverrini and MIFs using molecular study by PCR and PCR-restriction fragment length polymorphism targeting the internal transcribed spacer 2 (ITS2) gene. Prevalence of Opisthorchis-like eggs was 5.9% from a total of 9,570 specimens. From PCR assays, all liver flukes were O. viverrini and all MIFs were Haplorchis taichui. The distribution of species was H. taichui (38.2%), O. viverrini (10.5%), coinfection of H. taichui and O. viverrini (37.2%), and 14.1% were negative from PCR. Totally, H. taichui was found in 75.4% of infections from Opisthorchis-like specimens. ITS2 nucleotide sequencing analysis showed a single variant of O. viverrini with no variation and two variants of H. taichui. This study first revealed the genetic background of Opisthorchis-like eggs in northern Thailand. Minute intestinal flukes are occasionally misdiagnosed as O. viverrini leading to misinterpretation and overestimation of the burden of O. viverrini infection. Molecular diagnosis such as PCR could effectively discriminate species of Opisthorchis-like eggs and help shape the robustness of epidemiological data to control liver fluke infection and raise awareness of other risk factors for CCA.
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Affiliation(s)
- Saiwasan Buathong
- Department of Parasitology, Phramongkutklao College of Medicine, Bangkok, Thailand
- Department of Clinical Pathology, Faculty of Medicine Vajira Hospital, Navamindradhiraj University, Bangkok, Thailand
| | - Kateitsaray Phaiphilai
- Communicable Disease Control Sector, Chiang Mai Provincial Health Office, Chiang Mai, Thailand
| | - Toon Ruang-areerate
- Department of Parasitology, Phramongkutklao College of Medicine, Bangkok, Thailand
| | - Naruemon Sitthichot
- Department of Parasitology, Phramongkutklao College of Medicine, Bangkok, Thailand
| | - Thanyapit Thita
- Drug Research Unit for Malaria, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Mathirut Mungthin
- Department of Parasitology, Phramongkutklao College of Medicine, Bangkok, Thailand
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Intestinal parasites in rural communities in Nan Province, Thailand: changes in bacterial gut microbiota associated with minute intestinal fluke infection. Parasitology 2020; 147:972-984. [PMID: 32364103 DOI: 10.1017/s0031182020000736] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Gastrointestinal helminth infection likely affects the gut microbiome, in turn affecting host health. To investigate the effect of intestinal parasite status on the gut microbiome, parasitic infection surveys were conducted in communities in Nan Province, Thailand. In total, 1047 participants submitted stool samples for intestinal parasite examination, and 391 parasite-positive cases were identified, equating to an infection prevalence of 37.3%. Intestinal protozoan species were less prevalent (4.6%) than helminth species. The most prevalent parasite was the minute intestinal fluke Haplorchis taichui (35.9%). Amplicon sequencing of 16S rRNA was conducted to investigate the gut microbiome profiles of H. taichui-infected participants compared with those of parasite-free participants. Prevotella copri was the dominant bacterial operational taxonomic unit (OTU) in the study population. The relative abundance of three bacterial taxa, Ruminococcus, Roseburia faecis and Veillonella parvula, was significantly increased in the H. taichui-infected group. Parasite-negative group had higher bacterial diversity (α diversity) than the H. taichui-positive group. In addition, a significant difference in bacterial community composition (β diversity) was found between the two groups. The results suggest that H. taichui infection impacts the gut microbiome profile by reducing bacterial diversity and altering bacterial community structure in the gastrointestinal tract.
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Adenosine Suppresses Cholangiocarcinoma Cell Growth and Invasion in Equilibrative Nucleoside Transporters-Dependent Pathway. Int J Mol Sci 2020; 21:ijms21030814. [PMID: 32012688 PMCID: PMC7037771 DOI: 10.3390/ijms21030814] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2019] [Revised: 01/22/2020] [Accepted: 01/25/2020] [Indexed: 12/17/2022] Open
Abstract
Cholangiocarcinoma (CCA) is a lethal disease with increasing incidence worldwide. Previous study showed that CCA was sensitive to adenosine. Thereby, molecular mechanisms of CCA inhibition by adenosine were examined in this study. Our results showed that adenosine inhibited CCA cells via an uptake of adenosine through equilibrative nucleoside transporters (ENTs), instead of activation of adenosine receptors. The inhibition of ENTs by NBTI caused the inhibitory effect of adenosine to subside, while adenosine receptor antagonists, caffeine and CGS-15943, failed to do so. Intracellular adenosine level was increased after adenosine treatment. Also, a conversion of adenosine to AMP by adenosine kinase is required in this inhibition. On the other hand, inosine, which is a metabolic product of adenosine has very little inhibitory effect on CCA cells. This indicates that a conversion of adenosine to inosine may reduce adenosine inhibitory effect. Furthermore, there was no specific correlation between level of proinflammatory proteins and CCA responses to adenosine. A metabolic stable analog of adenosine, 2Cl-adenosine, exerted higher inhibition on CCA cell growth. The disturbance in intracellular AMP level also led to an activation of 5′ AMP-activated protein kinase (AMPK). Accordingly, we proposed a novel adenosine-mediated cancer cell growth and invasion suppression via a receptor-independent mechanism in CCA.
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Parasitic infections in relation to practices and knowledge in a rural village in Northern Thailand with emphasis on fish-borne trematode infection. Epidemiol Infect 2018; 147:e45. [PMID: 30428954 PMCID: PMC6518572 DOI: 10.1017/s0950268818002996] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The present study integrates several aspects of a parasitological survey in a rural community village combining community knowledge of parasites, their potential transmission routes and health risk factors. A rural community located in Northern Thailand was surveyed for intestinal parasites, and an overall prevalence of 45.2% for helminths and 4.8% for protozoan infections was identified. Socio-demographic characteristics, customs and perceptions were compiled using individual questionnaires and interviews for participants surveyed for parasitic screening. The results allowed us to determine the knowledge and perception of local people concerning helminthic infection and transmission. Despite the fact that the participants in this community were aware of parasitic transmission routes, their widespread custom of eating raw fish and meat render the reduction of helminthiasis difficult. A detailed study on the infection of fish-borne parasitic trematodes, the most prevalent helminth, allowed us to determine that the distance from a given household to the river is a determinant of infection intensity. Health education activities organised in the local community resulted in a change in perception of risks associated with parasite transmission.
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Buathong S, Leelayoova S, Mungthin M, Ruang-areerate T, Naaglor T, Suwannahitatorn P, Piyaraj P, Taamasri P, Tan-ariya P. Molecular discrimination of Opisthorchis-like eggs from residents in a rural community of central Thailand. PLoS Negl Trop Dis 2017; 11:e0006030. [PMID: 29095828 PMCID: PMC5685638 DOI: 10.1371/journal.pntd.0006030] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Revised: 11/14/2017] [Accepted: 10/11/2017] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Opisthorchis viverrini infection is a major public health problem in northern and northeastern Thailand. The chronic infection of O. viverrini is related to cholangiocarcinoma which causes high mortality in endemic areas. Therefore, the diagnosis, treatment, control and prevention of O. viverrini infection are necessary. The morphology of the egg is very similar to that of other species of human liver flukes (Opisthorchis felineus and Clonorchis sinensis) as well as that of small intestinal flukes in the family Heterophyidae. Thus, molecular characterization is crucially required to discriminate species of Opisthorchis-like eggs in fecal examination. METHODOLOGY/PRINCIPAL FINDINGS We aimed to determine the prevalence of O. viverrini infection among villagers living in Sanamchaikate District, Chachoengsao Province, in central Thailand, where O. viverrini infection has previously been reported. A total of 2,609 fecal samples were examined for Opisthorchis-like eggs using microscopic examination. PCR-RFLP analysis of the ITS2 region was used to discriminate Opisthorchis-like eggs. The genetic structure of O. viverrini infection was demonstrated using nucleotide sequencing of cytochrome c oxidase subunit I (cox1) and NADH dehydrogenase subunit 1 (nad1). Testing of evolutionary neutrality of the cox1 and nad1 sequences of O. viverrini was performed using Tajima's D tests and Fu's Fs tests. Moreover, the haplotype networks and phylogenetic trees were constructed to study the relationships of O. viverrini isolated from different endemic areas. A high prevalence of O. viverrini infection is still observed in a rural community of Chachoengsao Province, central Thailand. The overall prevalence of Opisthorchis-like eggs using microscopic examination was 16.8%. PCR-RFLP profiles showed the predominant infection of O. viverrini (9.6%) including very low infections of other small intestinal flukes, Haplorchis taichui (0.08%) and Euparyphium albuferensis (0.08%). The genetic structure of O. viverrini populations in central Thailand was also described and revealed a non-significant difference in genetic diversity. In addition, the genetic background of the O. viverrini populations was closely related to the isolate from Lao PDR. CONCLUSIONS/SIGNIFICANCE Our study highlighted the prevalence of O. viverrini infection in central Thailand indicating that control programs and health education regarding opisthorchiasis is still required in this endemic area. Additionally, the study demonstrated the genetic structure of O. viverrini, in central Thailand which could provide information on the molecular epidemiology of this parasite.
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Affiliation(s)
- Saiwasan Buathong
- Department of Microbiology, Faculty of Science, Mahidol University, Bangkok, Thailand
| | - Saovanee Leelayoova
- Department of Parasitology, Phramongkutklao College of Medicine, Ratchathewi, Bangkok, Thailand
| | - Mathirut Mungthin
- Department of Parasitology, Phramongkutklao College of Medicine, Ratchathewi, Bangkok, Thailand
| | - Toon Ruang-areerate
- Department of Parasitology, Phramongkutklao College of Medicine, Ratchathewi, Bangkok, Thailand
| | - Tawee Naaglor
- Department of Parasitology, Phramongkutklao College of Medicine, Ratchathewi, Bangkok, Thailand
| | - Picha Suwannahitatorn
- Department of Parasitology, Phramongkutklao College of Medicine, Ratchathewi, Bangkok, Thailand
| | - Phunlerd Piyaraj
- Department of Parasitology, Phramongkutklao College of Medicine, Ratchathewi, Bangkok, Thailand
| | - Paanjit Taamasri
- Department of Parasitology, Phramongkutklao College of Medicine, Ratchathewi, Bangkok, Thailand
| | - Peerapan Tan-ariya
- Department of Microbiology, Faculty of Science, Mahidol University, Bangkok, Thailand
- * E-mail:
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Chai JY, Jung BK. Fishborne zoonotic heterophyid infections: An update. Food Waterborne Parasitol 2017; 8-9:33-63. [PMID: 32095640 PMCID: PMC7034020 DOI: 10.1016/j.fawpar.2017.09.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Revised: 09/02/2017] [Accepted: 09/05/2017] [Indexed: 12/12/2022] Open
Abstract
Fishborne heterophyid trematodes infecting humans are at least 29 species worldwide and belong to 13 genera. Its global burden is much more than 7 million infected people. They include Metagonimus (M. yokogawai, M. takahashii, M. miyatai, M. minutus, and M. katsuradai), Heterophyes (H. heterophyes, H. nocens, H. dispar, and H. aequalis), Haplorchis (H. taichui, H. pumilio, H. yokogawai, and H. vanissimus), Pygidiopsis (P. summa and P. genata), Heterophyopsis (H. continua), Stellantchasmus (S. falcatus), Centrocestus (C. formosanus, C. armatus, C. cuspidatus, and C. kurokawai), Stictodora (S. fuscata and S. lari), Procerovum (P. varium and P. calderoni), Acanthotrema (A. felis), Apophallus (A. donicus), Ascocotyle (A. longa), and Cryptocotyle (C. lingua). Human infections are scattered around the world but the major endemic areas are located in Southeast Asia. The source of human infection is ingestion of raw or improperly cooked fish. The pathogenicity, host-parasite relationships, and clinical manifestations in each species infection are poorly understood; these should be elucidated particularly in immunocompromised hosts. Problems exist in the differential diagnosis of these parasitic infections because of close morphological similarity of eggs in feces and unavailability of alternative methods such as serology. Molecular diagnostic techniques are promising but they are still at an infant stage. Praziquantel has been proved to be highly effective against most of the patients infected with heterophyid flukes. Epidemiological surveys and detection of human infections are required for better understanding of the geographical distribution and global burden of each heterophyid species. In this review, the most updated knowledge on the morphology, biology, epidemiology, pathogenesis and pathology, immunology, clinical manifestations, diagnosis and treatment, and prevention and control of fishborne zoonotic heterophyid infections is provided.
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Affiliation(s)
- Jong-Yil Chai
- Institute of Parasitic Diseases, Korea Association of Health Promotion, Seoul 07649, Republic of Korea
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