Changing patterns of spatial clustering of schistosomiasis in southwest China between 1999-2001 and 2007-2008: Assessing progress toward eradication after the World bank loan project

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Abstract

We compared changes in the spatial clustering of schistosomiasis in Southwest China at the conclusion of and six years following the end of the World Bank Loan Project (WBLP), the control strategy of which was focused on the large-scale use of chemotherapy. Parasitological data were obtained through standardized surveys conducted in 1999-2001 and again in 2007-2008. Two alternate spatial cluster methods were used to identify spatial clusters of cases: Anselin's Local Moran's I test and Kulldorff's spatial scan statistic. Substantial reductions in the burden of schistosomiasis were found after the end of the WBLP, but the spatial extent of schistosomiasis was not reduced across the study area. Spatial clusters continued to occur in three regions: Chengdu Plain, Yangtze River Valley, and Lancang River Valley during the two periods, and regularly involved five counties. These findings suggest that despite impressive reductions in burden, the hilly and mountainous regions of Southwest China remain at risk of schistosome re-emergence. Our results help to highlight specific locations where integrated control programs can focus to speed the elimination of schistosomiasis in China. © 2014 by the authors; licensee MDPI, Basel, Switzerland.

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Hu, Y., Xiong, C., Zhang, Z., Luo, C., Cohen, T., Gao, J., … Jiang, Q. (2014). Changing patterns of spatial clustering of schistosomiasis in southwest China between 1999-2001 and 2007-2008: Assessing progress toward eradication after the World bank loan project. International Journal of Environmental Research and Public Health, 11(1), 701–712. https://doi.org/10.3390/ijerph110100701

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