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Analysis of the temporal and spatial distribution characteristics of newly reported advanced schistosomiasis in Poyang County |
WU Xin-hua1, XIE Shu-ying2, LIU Li1, HU Xiao-li1, WANG Rao-chun1, GAO Zu-lu2, NING An2, HU Fei2 |
1. Poyang County Station of Schistosomiasis Control, Jiangxi Province, Poyang 333100, China; 2. Jiangxi Provincial Institute of Parasitic Diseases, Jiangxi Province Key Laboratory of Schistosomiasis Prevention and Control, Nanchang 330046, China |
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Abstract This study aimed to analyze the temporal and spatial distribution characteristics of newly reported advanced schistosomiasis cases in Poyang County to provide a scientific basis for controlling advanced schistosomiasis. On the basis of a spatial database of the endemic administrative village area, we performed statistical analysis of advanced schistosomiasis cases reported from 2009 to 2019 by using SaTScan spatiotemporal scanning statistical software according to three scanning detection modes: space, time and time-space. The results were visualized with ArcMap. From 2009 to 2019, a total of 932 cases of advanced schistosomiasis were reported in Poyang County, and the annual occurrence rate showed a downward trend each year. Most cases appeared in 2010-2013. The occurrence rate of advanced schistosomiasis cases in the epidemic control stage was significantly higher than that in the transmission control stage (F=9.617, P=0.013). Simple spatial scanning revealed two clustered areas of category I, which appeared in the epidemic control stage, and four clustered areas of category II, which appeared in the transmission control stage. Simple time scanning showed that advanced schistosomiasis cases were concentrated in 2012-2013 (RR=64.44, P=0.001) at the epidemic control stage and in 2018 (RR=11.23, P=0.001) at the transmission control stage. Time-space scanning showed a total of two category I high-risk areas and one category II high-risk area in 2009-2019, all of which were distributed along Poyang Lake. No category I high-risk area was found in the transmission control stage. With the control of the epidemic, the number of advanced schistosomiasis cases also decreased gradually, but several high-risk areas remained in the spatial distribution. For those areas, screening and treatment measures for advanced cases should be further strengthened.
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Received: 11 December 2020
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Fund:Supported by the National Natural Science Foundation of China(No. 71764011, No. 81860371), Jiangxi Province Focus on Research and Development Plan (No. 20202BBGL73047, No. 20181BBG70033), Key Laboratory Plan of Jiangxi Province(No.20192BCD40006), Jiangxi Province Natural Science Foundation(No. 20202BABL206118) |
Corresponding Authors:
Hu Fei, Email: hufei@21cn.com
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