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Hybridization increases genetic diversity in Schistosoma haematobium populations infecting humans in Cameroon

Infectious Diseases of Poverty 2022年第2期11卷 100-100页

作者： Felicite Flore Djuikwo Teukeng Manon Blin Nicolas Bech Marta Reguera Gomez Rima Zein-Eddine Alain Michel Kouam Simo Jean-Francois Allienne louis albert tchuem‑tchuente Jerome Boissier Faculty of Heath Science Mountain UniversityP.O.Box 208BangangteCameroon 不详

Background:Hybrids between Schistosoma haematobium(Sh)and ***(Sb)have been found in several African countries as well as in *** the consequences of this hybridization are still unknown,this study aims to verify the presence of such hybrids in Cameroonian humans,to describe the structure of *** populations on a large geographic scale,and to examine the impact of these hybrids on genetic diversity and structure of these ***:From January to April 2019,urine from infected children was collected in ten geographically distinct popu‑*** were collected from eggs in this *** detect the presence of hybrids among these miracidia we genotyped both Cox1(RD-PCR)and ITS2 gene(PCR-RFLP).Population genetic diversity and structure was assessed by genotyping each miracidium with a panel of 14 microsatellite *** diversity was measured using both heterozygosity and allelic richness indexes,and genetic structure was analyzed using paired Fst,PCA and Bayesian ***:Of the 1327 miracidia studied,88.7% were identifed as pure genotypes of ***(Sh_Sh/Sh)while the remaining 11.3% were hybrids(7.0% with Sh_Sh/Sb,3.7% with Sb_Sb/Sh and 0.4% with Sb_Sh/Sb).No miracidium has been identifed as a pure genotype of *** richness ranged from 5.55(Loum population)to 7.73(MattaBarrage)and difered signifcantly between *** heterozygosity ranged from 53.7%(Loum)to 59%(Matta Barrage)with no signifcant *** overall genetic diferentiation inferred either by a principal compo‑nent analysis or by the Bayesian approach shows a partial *** populations(Loum and Matta Bar‑rage)were clearly separated from other localities but genetic diferentiation between northern localities was limited,certainly due to the geographic proximity between these ***:Hybrids between *** and *** were identifed in 11.3% of miracidia that hatched from eggs present in the urine o

关键词： Schistosoma haematobium Schistosoma bovis Genetic diversity Hybridization Miracidium Cameroon

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Towards interruption of schistosomiasis transmission in sub-Saharan Africa:developing an appropriate environmental surveillance framework to guide and to support‘end game’interventions

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Infectious Diseases of Poverty 2017年第1期6卷 78-88页

作者： J.Russell Stothard Suzy J.Campbell Mike Y.Osei-Atweneboana Timothy Durant Michelle C.Stanton Nana-Kwadwo Biritwum David Rollinson Dieudonne R.Eloundou Ombede louis-albert tchuem-tchuente Department of Parasitology Liverpool School of Tropical MedicinePembroke PlaceLiverpool L35QAUK Department of Environmental Biology and Health Council for Scientific and Industrial Research-Water Research InsituteP.O.Box M 32AccraGhana Neglected Tropical Diseases Programme Ghana Health ServicesAccraGhana Department of Life Sciences Natural History MuseumCromwell RoadLondon SW75BDUK Centre for Schistosomiasis and Parasitology YaoundeCameroon Laboratory of Parasitology and Ecology Faculty of SciencesUniversity of YaoundeIYaoundeCameroon National Programme for the Control of Schistosomiasis and Intestinal Helminthiasis Ministry of Public HealthYaoundeCameroon

Schistosomiasis is a waterborne parasitic disease in sub-Saharan Africa,particularly common in rural populations living in impoverished *** the scale-up of preventive chemotherapy,national campaigns will transition from morbidity-to transmission-focused interventions thus formal investigation of actual or expected declines in environmental transmission is needed as‘end game’scenarios ***,there are no international or national guidelines to do so in sub-Saharan *** article therefore provides an introduction to key practicalities and pitfalls in the development of an appropriate environmental surveillance *** this context,we discuss how strategies need to be adapted and tailored to the local level to better guide and support future interventions through this *** detection of egg-patent infection in people becomes rare,careful sampling of schistosome larvae in freshwater and in aquatic snails with robust species-specific DNA assays will be *** metrics,derived from observed prevalence(s)as compared with predetermined thresholds,could each provide a clearer insight into contamination-and exposure-related *** could be twofold,first to certify areas currently free from schistosomiasis transmission or second to red-flag recalcitrant locations where extra effort or alternative interventions are needed.

关键词： Environmental monitoring Freshwater snails eDNA WASH Zoonosis

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Building a global schistosomiasis alliance:an opportunity to join forces to fight inequality and rural poverty

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Infectious Diseases of Poverty 2017年第1期6卷 558-563页

作者： Lorenzo Savioli Marco Albonico Daniel G.Colley Rodrigo Correa-Oliveira Alan Fenwick Will Green Narcis Kabatereine Achille Kabore Naftale Katz Katharina Klohe Philip TLoVerde David Rollinson JRussell Stothard louis-albert tchuem tchuente Johannes Waltz Xiao-Nong Zhou Global Schistosomiasis Alliance GenevaSwitzerland Center for Tropical Diseases Sacro Cuore Hospital-WHO Collaborating Centre on strongyloidiasis and other intestinal parasitic infectionsNegrarVeronaItaly Schistosomiasis Consortium for Operational Research and Evaluation The University of GeorgiaAthensGeorgiaUSA Centro de Pesquisas ReneRachou-Fiocruz Belo HorizonteBrazil and Universidade Federal de Ouro PretoOuro PretoBrazil Department of Infectious Disease Epidemiology SCIImperial CollegeLondonUK Trinity College Cambridge CambridgeUK Imperial College London LondonUK RTI International WashingtonDCUSA Research Center Rene Rachou-Oswaldo Cruz Foundation Belo HorizonteBrazil Global Schistosomiasis Alliance MunichGermany University of Texas Health Science Center San AntonioTXUSA Life Sciences Department The Natural History MuseumLondonUK Department of Parasitology Liverpool School of Tropical MedicineLiverpool L35QAUK Centre for Schistosomiasis&Parasitology YaoundeCameroon Global Schistosomiasis Alliance LondonUK National Institute of Parasitic Diseases Chinese Center for Disease Control and Prevention ShanghaiChina

Schistosomiasis,one of the 17 neglected tropical diseases listed by the World Health Organization,presents a substantial public health and economic *** the 261 million people requiring preventive chemotherapy for schistosomiasis in 2013,92%of them lived in sub-Saharan Africa and only 12.7%received preventive ***,in 2010,the WHO reported that schistosomiasis mortality could be as high as 280000 per year in Africa *** May 2012 delegates to the sixty-fifth World Health Assembly adopted resolution WHA65.21 that called for the elimination of schistosomiasis,and foresees the regular treatment of at least 75%of school age children in at-risk *** resolution urged member states to intensify schistosomiasis control programmes and to initiate elimination campaigns where *** this,in June 2015,schistosomiasis was indicated to have the lowest level of preventive chemotherapy implementation in the spectrum of neglected tropical *** was also highlighted as the disease most lacking in *** is perhaps unsurprising,given that it was also the only NTD with access to drug donations but without a coalition of stakeholders that collaborates to boost commitment and *** a consequence,and to ensure that the WHO NTDs Roadmap Targets of 2012 and World Health Assembly Resolution WHA65.21 are met,the Global Schistosomiasis Alliance(GSA)has been set *** and representative,the GSA aims to be a partnership of endemic countries,academic and research institutions,international development agencies and foundations,international organizations,non-governmental development organizations,private sector companies and advocacy and resource mobilisation ***,the GSA calls for a partnership to work for the benefit of endemic countries by addressing health inequity and rural poverty.

关键词： Neglected tropical diseases Schistosomiasis Global Schistosomiasis Alliance Elimination

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Institution-based Network on China-Africa Cooperation for Schistosomiasis Elimination (INCAS): Driving schistosomiasis elimination in Africa

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Global Health Journal 2019年第1期3卷 16-20页

作者： Eniola Michael Abe Jing Xu louis-albert tchuem Tchuenté Moussa Sacko Yunhai Guo Shizhu Li Xiao-Nong Zhou National Institute of Parasitic Diseases Chinese Center for Diseases Control and PreventionShanghai200025China World Health Organization Collaborating Centre for Tropical Diseases Shanghai200025China Research Centre for Schistosomiasis&Parasitology P.O.Box7244YaoundeCameroon National Institute for Research in Public Health Ministry of HealthBP1771BamakoMali

The burden of schistosomiasis remains a global public health problem,especially in sub-Saharan Africa despite progress in terms of morbidity *** control efforts achieved by China in the last six decades came with considerable experience and lessons that could benefit schistosomiasis control programs in other endemic ***'s role and commitment to global health cooperation has become increasingly important;this has created a platform for partnership with developing partners for the establishment of Forum on China-Africa health cooperation which prioritizes the pursuit of global elimination target for schistosomiasis and malaria,control of HIV/AIDS,and improved access to reproductive health *** government's commitment towards achieving schistosomiasis elimination in Africa prompted the establishment of Institution-based Network on China-Africa Cooperation for Schistosomiasis Elimination (INCAS),by the National Institute of Parasitic Diseases to promote schistosomiasis elimination in *** experts from six provincial institutions and counterparts from 10 African countries participated in the first workshop on China-Africa cooperation for Schistosomiasis Elimination in Africa at Lilongwe,Malawi,in *** at the inaugural meeting shared experiences from their national schistosomiasis control programs,as well as identified areas for collaborative synergy targeting schistosomiasis elimination in *** establishment of INCAS,which comprises of 28 member-institutions from China and Africa,was proposed at this ***,therefore,provide information on INCAS activities,cooperation mechanism,as well as assess the strengths,weaknesses,opportunities,and threats as we target schistosomiasis elimination in Africa using the INCAS platform.

关键词： Institution-based Network Cooperation Schistosomiasis Elimination Driving China Africa

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