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[Spatial analysis of distribution of schistosomiasis in Anhui Province]
Feng-Hua Gao1, Shi-Qing Zhang, Tian-Ping Wang
1Anhui Institute of Parasitic Diseases, Hefei 230061, China.
Objective:
To study the distribution of schistosomiasis in Anhui Province based on geographic information system (GIS).
Methods:
The survey data of disease and Oncomelania snails in Anhui Province in 2006 were collected, GIS databases were set up, and the inverse distance weighted interpolation method (IDW) based on ArcGIS 9.3 was used to analyze the spatial distribution of schistosomiasis across the province.
Results:
The simulated maps of distribution of human prevalence and positive rate of serological tests were imitated by using IDW. The region with heavier infection rates of schistosomiasis was distributed over the region of the Yangtze River in Anhui Province, and the endemic areas were joined into a patch in the upper and middle reaches and distributed in pieces in the lower reaches. While the endemic areas were compared with the distribution of infected snails, the IDW map of positive rate of serological tests was more exactly than that of the human prevalence.
Conclusions:
The IDW method is helpful to show the distribution of schistosomiasis. The positive rate of serological tests is more sensitive to reflect the current endemic situation of schistosomiasis in Anhui Province.
