Spatial Distribution Of Schistosomiasis Susceptible-Area In Poyang Lake

Schistosomiasis is a natural foci of endemic parasitic disease with people andlivestock. The eight counties along the Poyang Lake coastis not yet blocking thespread of schistosomiasis, pose alarger threat to the affected areas of populationwell-being, economic development and social progress.Into the21st century, theprevalence of schistosomiasis infection enter the historically low levels, but there arestill higher risk of infection in some partsareas, in that the geographical environmentfeature are complex and diverse, high risk of infection for people and livestockactivities, andthere are lots of questions and uncertain factors in studies.Integrated useof surveys, Geo-informatics methodsis a new and effective way.Refer to the relevant research and found that the formation of schistosomiasissusceptible-areas is closely related to theclimate, hydrology, vegetation, soil,elevation, cultural backgroundand socio-economic conditions.The main epidemiccharacteristics are the wild manure distribution concentrated, infected snailsdensityand Schistosomiasis cercariaedensity arehigher, humanand livestock activitiesmorefrequently and the infection rate also higher than other areas. At these areas thespread of schistosomiasis’srelated natural and social susceptibility factor are highlyoverlapping, the infection on a highest risk level and the water and landalwaysalternately. Thesusceptible-areasdistribution in spaceis stability, and thesusceptible strength there is a seasonal.Schistosomiasis epidemic areas in Poyang Lake distributewidely.Themacro-spatial differences in geomorphological and hydrological conditions are themain basis geographical classification for schistosomiasissusceptible-areas.Spacedifference in ways of contacting epidemic water, awareness of anti-schistosomiasisand Schistosomiasis control measures affected by cultural, social, economicofdifferent epidemic areas formed the non-zonal geographic differentiation.AndPoyang Lake susceptible-areawas divided intofour different categories, that isislet,embankment,distributaries of lakeand flood plain.We site surveyed the distinguishingfeature ofgeographicalandenvironmental for different types,andselectedthetypicalvillagessurveyedtheepidemiological characteristicsby questionnaire, andthen take Nanchang County of embankmenttypeforexample analyzedthe temporal andspatial distributionfeatureofschistosomiasis. The results showed thateach type ofsusceptible-area has a different geomorphology and hydrological combined feature.The statistical analysis showed that theepidemic feature ofsusceptibility-areas at Poyang Lake is complex and diverse,theaspects of epidemic feature havesomedifferences. And there is a higherinfection rates of schistosomiasis where thevillage is closer to the grassland, and also a higher infective snails density when thereis a small distancebetweengrassland and villages. The data shows that there isanoverall epidemic downward trend between the years2004-2009, but there are stillsome high-risk susceptible-areas, and aggregated distribution, local epidemic is alsounstablein the inter-annual.Using a combination ofqualitative and quantitativespatial analysismethods,establisha knowledge base and geographic modelthat based the spatialassociation between the chistosomiasis susceptible area andthe relevant geographicfactors.Simulated the spatial distribution of schistosomiasissusceptible-areainNanchang County by the Knowledge-drivenmethod. The resultsshowed that the schistosomiasis susceptible-areaat Nanchang Countycoastal beachgrassland distribution is concentrated and contiguous.Bounded by dykes, and there isown widelypotential high-risk infectionareasoutside the dykes. The highest risksusceptible-areasnear the outside-dykes werepunctate or massive distribution.Specially, the settlements ofWufeng, Yufeng, Jiangunzhouand Wuxing Farm are mostsusceptible toschistosomiasis.