Dynamics of freshwater snails and Schistosoma infection prevalence in schoolchildren during the construction and operation of a multipurpose dam in central Côte d’Ivoire  

作　　者：Nana R.Diakite Mirko S.Winkler Jean T.Coulibaly Negnorogo Guindo-Coulibaly Jürg Utzinger Eliezer K.N’Goran 

机构地区：[1]Laboratoire de Zoologie et Biologie Animale,Unitede Formation et de Recherche Biosciences,Universite Felix Houphouët-Boigny,22 BP 522,Abidjan 22,Cote d’Ivoire [2]Swiss Tropical and Public Health Institute,P.O.Box,CH-4002,Basel,Switzerland [3]University of Basel,P.O.Box,CH-4003,Basel,Switzerland [4]Departement Environnement et Sante,Centre Suisse de Recherches Scientifiques en Cote d’Ivoire,01 BP 1303,Abidjan 01,Cote d’Ivoire

出　　处：《Infectious Diseases of Poverty》2017年第1期810-818,共9页贫困所致传染病（英文）

基　　金：This study was financially supported by the Swiss-based non-governmental organization FAIRMED(Bern,Switzerland).

摘　　要：Background:The construction and operation of small multipurpose dams in Africa have a history of altering the transmission of water-based diseases,including schistosomiasis.The current study was designed to investigate the abundance and dynamics of schistosomiasis intermediate host snails and Schistosoma infections in humans during the construction and the first years of operation of a small multipurpose dam in Côte d’Ivoire.Methods:The study was carried out in Raffierkro and four neighbouring villages in central Côte d’Ivoire between 2007 and 2012.Snails were collected by two experienced investigators using scoops and forceps for 15 min at each site.Snails were identified at genera and,whenever possible,species level,and subjected to testing for cercarial shedding.Schoolchildren aged 6-15 years were examined once every year for Schistosoma haematobium and S.mansoni infection,using urine filtration and duplication Kato-Katz thick smears,respectively.Additionally,551 adults were examined for Schistosoma infection before(June 2007)and 359 individuals 2 years after dam construction(June 2009).Results:Overall,1700 snails belonging to nine different genera were collected from 19 sampling sites.Bulinus(potential intermediate host snails of S.haematobium)and Pila were the most common genera,whereas Biomphalaria(potential intermediate host snail of S.mansoni),Lymnaea,Physa and Melanoides were found in two villages.During the first-year sampling period,65 snails were collected,of which 13(20%)were schistosomiasis intermediate hosts.In subsequent years,out of 1635 snails collected,1079(66%)were identified as potential intermediate host for schistosomiasis,but none were shedding cercariae.The prevalence of S.mansoni among adults in the study area was low(0.4%in 2007 and 0.3%in 2009),whereas the prevalence of S.haematobium declined from 13.9%to 2.9%in this two-year period.Conclusions:The low prevalence of schistosomiasis in humans and the absence of infected intermediate host snails during the construction and early ph

关 键 词：SCHISTOSOMIASIS Intermediate host snail Transmission Water resources development and management Multipurpose dam Cote d’Ivoire 

分 类 号：R53[医药卫生—内科学]