Abstract:

Objective The characteristics of spatial-temporal distribution on acute schistosomiasis were analyzed at village level in Dangtu County from 2003 to 2011. Methods Data on the distribution of acute schistosomiasis from 2003 to 2011 in Dangtu county was collected. The prevalence situation of acute schistosomiasis was analyzed with descriptive epidemiology. Spatial database was established by ArcGIS 10.0. Retrospective spatial-temporal cluster analysis was done by SaTscan 9.1.1 at village level．Results A total of 72 cases of acute schistosomiasis cases were reported from 2003 to 2011, among which 70 cases were infected in Dantu county. The mobidity of acute schistosomiasis decreased from 12.9 / one hundren thousand in 2003 to 0 in 2011; most cases were reported from July to September and concentrated in lake regions. Most of them were farmers (54.3%) and students (31.4%). The farmers were mostly infected by catching fish and the students were infected by swimming. Four areas with higher risk were detected by cluster analysis, including one area in Huyang township(LLR=31.4，RR=20.9) and one in Huangchi township（LLR=7.0，RR=10.4）from 2003 to 2004, one in Gushu township （LLR=16.5，RR=17.0) from 2003 to 2005, and one in Bowang township（LLR=12.3，RR=12.2) in 2003, respectively. Conclusions The spatial-temporal distribution of acute schistosomiasis was not random but there appeared significant clusters in Dangtu county from 2003 to 2011. Acute schistosomiasis has been controlled effectively after carrying out comprehensive control strategies which emphasis on infectious source control.

Key words: AcuteSchistosomiasis, Geographical information system, Space-time analysis