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Natural variables separate the endemic areas of Clonorchis sinensis and Opisthorchis viverrini along a continuous, straight zone in Southeast Asia

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贫困所致传染病(英文) 2024年第02期13卷 39-51页

作者： Zheng Jin-Xin Zhu Hui-Hui Xia Shang Qian Men-Bao Nguyen Hung Manh Sripa Banchob sayasone somphou Khieu Virak Bergquist Robert Zhou Xiao-Nong School of Global Health Chinese Center for Tropical Diseases Research Shanghai Jiao Tong University School of Medicine Shanghai China One Health Center Shanghai Jiao Tong University The University of Edinburgh Shanghai China National Institute of Parasitic Diseases at Chinese Center for Disease Control and Prevention (Chinese Center for Tropical Diseases Research) NHC Key Laboratory of Parasites and Vectors Biology WHO Collaborating Centre for Tropical Diseases National Center for International Research on Tropical Diseases Shanghai China Institute of Ecology and Biological Resources Graduate University of Science and Technology Vietnam Academy of Science and Technology Hoang Quoc Viet Street Hanoi Vietnam WHO Collaborating Centre for Research and Control of Opisthorchiasis (Southeast Asian Liver Fluke Disease) Tropical Disease Research Laboratory Department of Tropical Medicine Faculty of Medicine Khon Kaen University Mittraparb Road Khon Kaen Thailand Lao Tropical and Public Health Institute Ministry of Health Vientiane Lao PDR National Centre for Parasitology Entomology and Malaria Control Ministry of Health Phnom Penh Cambodia Ingerod Brastad Sweden (formerly at the UNICEF/UNDP/World Bank/WHO Special Programme for Research and Training in Tropical Diseases) World Health Organization Geneva Switzerland

Background Clonorchiasis and opisthorchiasis, caused by the liver flukesClonorchis sinensis andOpisthorchis viverrini respectively, represent significant neglected tropical diseases (NTDs) in Asia. The co-existence of these pathogens in overlapping regions complicates effective disease control strategies. This study aimed to clarify the distribution and interaction of these diseases within Southeast *** We systematically collated occurrence records of human clonorchiasis (n = 1809) and opisthorchiasis (n = 731) across the Southeast Asia countries. Utilizing species distribution models incorporating environmental and climatic data, coupled machine learning algorithms with boosted regression trees, we predicted and distinguished endemic areas for each fluke species. Machine learning techniques, including geospatial analysis, were employed to delineate the boundaries between these *** Our analysis revealed that the endemic range ofC. sinensis andO. viverrini in Southeast Asia primarily spans across part of China, Vietnam, Thailand, Laos, and Cambodia. During the period from 2000 to 2018, we identifiedC. sinensis infections in 84 distinct locations, predominantly in southern China (Guangxi Zhuang Autonomous Region) and northern Vietnam. In a stark contrast,O. viverrini was more widely distributed, with infections documented in 721 locations across Thailand, Laos, Cambodia, and Vietnam. Critical environmental determinants were quantitatively analyzed, revealing annual mean temperatures ranging between 14 and 20 °C in clonorchiasis-endemic areas and 24–30 °C in opisthorchiasis regions (P < 0.05). The machine learning model effectively mapped a distinct demarcation zone, demonstrating a clear separation between the endemic areas of these two liver flukes with AUC from 0.9 to1. The study in Vietnam delineates the coexistence and geographical boundaries ofC. sinensis andO. viverrini, revealing distinct endemic zones and a transitional area where both live

关键词： Liver fluke Clonorchiasis Opisthorchiasis Clonorchis sinensis Opisthorchis viverrine Southeast Asia Machine learning Ecological study

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Intestinal helminth infections and associated risk factors among adults in the Lao People’s Democratic Republic

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Infectious Diseases of Poverty 2023年第3期12卷 99-100页

作者： Sengaloun Phonekeo Sengchanh Kounnavong Manithong Vonglokham Latsamy Siengsounthone Anousin Homsana Sascha Gummin Penelope Vounatsu Prawat Nittiyanant Suchin Worawichawong Wichai Aekplakorn Peter Odermatt somphou sayasone Lao Tropical and Public Health Institute Ministry of HealthVientianeLao People’s Democratic Republic Epidemiology and Public Health Department Swiss Tropical and Public Health InstituteAllschwilSwitzerland University of Basel BaselSwitzerland Ramathibodi Hospital Faculty of MedicineMahidol UniversityBangkokThailand Department of Pathology Ramathibodi HospitalFaculty of MedicineMahidol UniversityBangkokThailand

Background Helminthiases are highly endemic in Southeast Asia,including the Lao People’s Democratic Republic(Lao PDR).This study aimed to assess the current intestinal helminth infections and the associated risk factors among adults across the Lao *** A cross-sectional survey was conducted in 165 villages across 17 provinces and the Vientiane Capital,Lao PDR.A multi-stage sampling method was employed to select the adult study participants(≥18 years).Data collection included(1)interview of the study participants,(2)physical measurements,and(3)a fve gram of stool sample from each study participant was collected and preserved in 10%formalin solution for intestinal helminth detection using formalin-ether concentration technique(FECT).Descriptive analysis was used to describe the socio-demographic characteristics of study participants and the prevalence of intestinal helminth *** regressions were applied to test the association between intestinal helminth infection and individual risk factors.A P-value below 0.05 was considered statistically *** A total of 2800 study participants were *** average age was 46.0 years;57.8%were ***,30.9%,8.6%and 1.5%of study participants were infected with one,two,or three diferent intestinal helminth species,*** the study participants 21.6%were infected with hookworm,18.8%with Opisthorchis viverrini-like(Ov-like)infection,4.8%with Strongyloides stercoralis,2.3%with Ascaris lumbricoides,1.5%with Trichuris trichiura,and 3.3%with Taenia ***-like infection was of high prevalence in the southern(28.8%)and central(21.3%)provinces,while hookworm(26.3%),***(7.3%),***(3.1%),and Taenia spp.(4.2%)were prevalent in the northern *** analysis showed that men were more likely to be infected with hookworm[adjusted odds ratio(aOR)=1.2,P=0.019].The Lao-Tai ethnic group had a 5.2-times(P<0.001)higher chance of having Ov-like infection than the minorit

关键词： Intestinal helminth Prevalence Risk factors Investigation Regions Lao PDR

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Cross-reaction of POC-CCA urine test for detection of Schistosoma mekongi in Lao PDR: a cross-sectional study

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Infectious Diseases of Poverty 2020年第4期9卷 66-74页

作者： Anousin Homsana Peter Odermatt Phonesavanh Southisavath Aya Yajima somphou sayasone Lao Tropical and Public Health Institute Ministry of HealthVientiane CapitalLao People's Democratic Republic Department of Epidemiology and Public Health Swiss Tropical and Public Health InstituteP.O.BoxCH-4002 BaselSwitzerland University of Basel P.O.BoxCH-4003 BaselSwitzerland Department of Radiology Mahosot HospitalMinistry of HealthVientiane CapitalLao People's Democratic Republic World Health Organization Western Pacific Regional OfficeManilaPhilippines

Background:The point-of-care circulating cathodic antigen(POC-CCA)test is increasingly used as a rapid diagnostic method for Schistosoma mansoni *** test has good sensitivity,although false positive results have been reported among pregnant women and patients with urine infections and *** validated the POC-CCA test's ability to diagnose Schistosoma mekongi infection in Lao People's Democratic Republic(Lao PDR),where *** is *** particular interest was the test's specificity and possible cross-reactivity with other helminth ***:We conducted a cross-sectional study of children and adults in the provinces of Champasack(Schistosoma mekongi and Opisthorchis viverrini endemic),Savannakhet(*** endemic)and Luang Prabang(soil-transmitted helminths endemic)between October 2018 and April ***-CCA and urine dipstick tests were administered to all study participants,while an additional pregnancy test was offered to *** stool samples were collected from participants and examined with a Kato-Katz test(two smears per stool).Logistic regression was used to associate potential confounding factors(predictors)with POC-CCA test results(outcome).Results:In ***-endemic Champasack,11.5%(n=366)and 0.5%(n=2)of study participants had positive POC-CCA and Kato-Katz test results,*** one of the two Kato-Katz positive patients was also POC-CCA *** Champasack and Luang Prabang,where *** is not endemic,the POC-CCA test yielded(presumably)false positive results for 6.0%(n=22)and 2.5%(n=9)of study participants,respectively,while all of the Kato-Katz tests were ***-CCA positive test results were significantly associated with *** infection(1.69,95%confidence interval(CI):1.02-2.77,P=0.042),increased leukocytes(adjusted Odds Ratio(aOR)=1.58,95%CI:1.15-2.17,P=0.005)and hematuria(aOR=1.50,95%CI:1.07-2.10,P=0.019)if the observed trace was counted as a positive test *** pregnant women f

关键词： Point-of-care circulating cathodic antigen Lao People's Democratic Republic Kato-Katz Schistosoma mekongi Opisthorchis viverrini Soil-transmitted helminth

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Transmission of Opisthorchis viverrini,Schistosoma mekongi and soil-transmitted helminthes on the Mekong Islands,Southern Lao PDR

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Infectious Diseases of Poverty 2017年第1期6卷 1157-1171页

作者： Youthanavanh Vonghachack Peter Odermatt Keoka Taisayyavong Souphanh Phounsavath Kongsap Akkhavong somphou sayasone Swiss Tropical and Public Health Institute BaselSwitzerland University of Basel BaselSwitzerland Faculty of Basic Sciences University of Health SciencesVientiane CapitalLao PDR Malariology Parasitology and Entomology StationChampasack provinceLao PDR Provincial Health Department Champasack provinceLao PDR National Institute of Public Health Ministry of HealthVientiane CapitalLao PDR

Background:Prevalence of Opisthorchis viverrini,Schistosoma mekongi and soil-transmitted helminths(STH)remains high in Lao People’s Democratic Republic(Lao PDR),despite control efforts including mass-drug administration,education and communication *** approaches are required to advance helminth ***:An ecohealth study was conducted on two Mekong islands in Southern *** and behavioural data were collected by *** and animal reservoir stools were *** *** Neotricula aperta snails were examined using *** water fish were examined using digestion *** random-effects analysis was used to find risk factors associated with helminth ***:Human infection rates with ***,hookworm,***,Trichuris trichiura,Ascaris lumbricoides and Taenia *** 60.7%,44.1%,22.2%,4.1%,0.6%and 0.1%,*** intensity infections were 4.2%,3.6%and 1.8%for ***,*** and hookworm,*** and *** infection rates among dogs and cats were 25.0%and 14.7%,*** the cats tested,53.1%were infected with *** of *** and *** in snails was 0.3%and 0.01%,*** prevalence of *** infection in fresh water fish was 26.9%,with the highest infection rates occurring in Hampala dispa(87.1%),Cyclocheilichthys apogon(85.7%)and Puntius brevis(40.0%).Illiteracy and lower socioeconomic status increased the risk of *** infection,while those aged 10-16 years and possessing latrines at home were less likely to be *** dogs and cats that consumed raw fish were significantly and positively associated with *** infection of the household *** ***,children under 9 years old were exposed significantly to this infection,compared to older age ***:There is a pressing need to design and implement an integrated helminth control intervention on the Mekong

关键词： Opisthorchis viverrini Schistosoma mekongi Animal hosts Bithynia species. Neotricula aperta Cyprinidae fish Southern Lao People's Democratic Republic Laos

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Comparison of novel and standard diagnostic tools for the detection of Schistosoma mekongi infection in Lao People’s Democratic Republic and Cambodia

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Infectious Diseases of Poverty 2017年第1期6卷 1123-1135页

作者： Youthanavanh Vonghachack somphou sayasone Virak Khieu Robert Bergquist Govert Jvan Dam Pytsje THoekstra Paul L.A.M.Corstjens Beatrice Nickel Hanspeter Marti Jürg Utzinger Sinuon Muth Peter Odermatt Faculty of Basic Sciences University of Health SciencesMinistry of HealthVientianeLao People’s Democratic Republic Swiss Tropical and Public Health Institute P.O.BoxCH-4002 BaselSwitzerland University of Basel P.O.BoxCH-4003 BaselSwitzerland National Institute of Public Health Ministry of HealthVientianeLao People’s Democratic Republic National Centre for Parasitology Entomology and Malaria ControlMinistry of HealthPhnom PenhCambodia Ingerod BrastadSweden Department of Parasitology Leiden University Medical CenterLeidenThe Netherlands Department of Molecular Cell Biology Leiden University Medical CenterLeidenThe Netherlands

Background:Given the restricted distribution of Schistosoma mekongi in one province in Lao People’s Democratic Republic(Lao PDR)and two provinces in Cambodia,together with progress of the national control programmes aimed at reducing morbidity and infection prevalence,the elimination of schistosomiasis mekongi seems ***,sensitive diagnostic tools will be required to determine whether elimination has been *** compared several standard and novel diagnostic tools in ***-endemic ***:The prevalence and infection intensity of *** were evaluated in 377 study participants from four villages in the endemic areas in Lao PDR and Cambodia using Kato-Katz stool examination,antibody detection based on an enzyme-linked immunosorbent assay(ELISA)and schistosome circulating antigen detection by lateral-flow *** highly sensitive test systems for the detection of cathodic and anodic circulating antigens(CCA,CAA)in urine and serum were ***:Stool microscopy revealed an overall prevalence of *** of 6.4%(one case in Cambodia and 23 cases in Lao PDR),while that of Opisthorchis viverrini,hookworm,Trichuris trichiura,Ascaris lumbricoides and Taenia *** 50.4%,28.1%,3.5%,0.3%and 1.9%,*** the urine samples,the tests for CCA and CAA detected *** infections in 21.0%and 38.7%of the study participants,*** the serum samples,the CAA assay revealed a prevalence of 32.4%,while a combination of the CAA assay in serum and in urine revealed a prevalence of 43.2%.There was a difference between the two study locations with a higher prevalence reached in the samples from Lao ***:The CCA,CAA and ELISA results showed substantially higher prevalence estimates for *** compared to Kato-Katz thick *** schistosomiasis mekongi in Lao PDR and Cambodia might thus have been considerably underestimated ***,sustained control efforts are still needed to break transmission of ***

关键词： Cambodia Food-borne trematodes Kato-Katz Lao People’s Democratic Republic Point-of-care circulating cathodic antigen Schistosoma mekongi Serology Soil-transmitted helminths Up-converting phosphorlateral-flow circulating anodic antigen

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Association between helminth infections and diabetes mellitus in adults from the Lao People’s Democratic Republic:a crosssectional study

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Infectious Diseases of Poverty 2018年第1期7卷 1110-1120页

作者： Nan Shwe Nwe Htun Peter Odermatt Phimpha Paboriboune somphou sayasone Malisa Vongsakid Vilayouth Phimolsarn-Nusith Xuan Duong Tran Phoum-Savath Ounnavong Navalone Andriama-Hefasoa Nilun-Done Senvanpan Anousine Homsana Baocher Lianosay Dalouny Xayavong Dimbitsoa Rakotomalala Robinson Phaivanh Bounsavath Phoy-Phaylinh Prasayasith Seng-Davanh Syphan Yi-Xiao Lu Kanchana Thilakoun Xaipa-Song Xaiyaphet Phout-Tasin Vongngakesone Ikenna C Eze Medea Imboden Banchob Sripa Daniel Reinharz Nicole Probst-Hensch Department of Epidemiology and Public Health Swiss Tropical and Public Health InstitutePO Box40024051 BaselSwitzerland University of Basel BaselSwitzerland The Francophone Institute for Tropical Medicine(International Program for Health in the Tropics) VientianeLao PDR Lao Tropical and Public Health Institute Ministry of HealthVientianeLao People’s Democratic Republic Tropical Disease Research Laboratory Faculty of MedicineKhon Kaen UniversityKhon KaenThailand Universite Laval Quebec CityCanada

Background:As a result of epidemiological transition,the health systems of low-and middle-income countries are increasingly faced with a dual disease burden of infectious diseases and emerging non-communicable *** is known about the mutual influence of these two disease *** aim of this study was to investigate the cooccurrence of helminth infections and diabetes mellitus in adults in Lao People’s Democratic Republic(Lao PDR).Methods:We conducted a cross-sectional study among 1600 randomly selected adults aged 35 and older from four different socio-economical and ecological *** on socio-demographics,risk factors and health conditions was obtained from personal *** assessments including anthropometry(height,weight,waist and hip circumference)and blood pressure measurements were also *** was classified based on selfreported diagnoses and a point-of-care glycated haemoglobin(HbA1c)test from finger prick blood *** samples for helminth diagnosis were examined with formalin-ether concentration technique for intestinal parasitic *** independent associations of helminth infections with diabetic status and HbA1c were assessed using multiple regression ***:The prevalence of pre-diabetes and diabetes was 37.3%and 22.8%,***-six percent of diabetic cases were undiagnosed and 85%of diagnosed diabetic cases had poor glycemic *** from rural areas and from southern parts of the country had higher infection rates,with Opisthorchis viverrini,being the most common helminth infection(30.5%).We found a positive association between Taenia *** and HbA1c(β=0.117;95%CI:0.042-0.200)and diabetes mellitus risk(OR=2.98;95%CI:1.10-8.05).No other helminth species was associated with glycated ***:Hyperglycaemia and diabetic rates in Lao PDR are alarmingly high,but consistent with other high rates in the *** the high rates of unde

关键词： Dual burden of disease Opisthorchis viverrini Taenia Diabetes mellitus Cross-sectional Epidemiology Adults Lao PDR

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