title: [Spatial-temporal analysis on the distribution of infected snail at the village level in Anhui province, 2006-2012].
abstract: OBJECTIVE
  The characteristics of spatial-temporal distribution on infected snails were analyzed at the village level in Anhui province, 2006-2012.
  
  
  METHODS
  Data on the distribution of infected snails from 2006 to 2012 in Anhui province was collected. Spatial database was established by ArcGIS 9.3. Retrospective spatial-temporal cluster analysis was done by SaTScan 9.1.1 at the village level.
  
  
  RESULTS
  Eight areas with increased risk and distributed along the upstream to downstream of Yangtze and connecting branch rivers, were found having infected snails, from 2006 through 2012, including one area in 2006, five in 2006-2008, one in 2007-2009 and one in 2009-2011, respectively. Proportion on the number of areas with infected snails decreased from 6.2% in 2006 to 0.5% in 2012.
  
  
  CONCLUSIONS
  The spatial-temporal distribution of infected snail was not random but there appeared significant clusters. The trend seemed to be declining in Anhui province, between 2006 and 2012. Areas being detected as snails positive were important for the schistosomiasis control program to be carried out in Anhui province.
authors: Anhui Provincial Institute of Schistosomiasis Control, Hefei 230061, China.
authors: Feng-hua
authors: FH
authors: Gao
authors: Anhui Provincial Institute of Schistosomiasis Control, Hefei 230061, China.
authors: Shi-qing
authors: SQ
authors: Zhang
authors: Anhui Provincial Institute of Schistosomiasis Control, Hefei 230061, China.
authors: Jia-chang
authors: JC
authors: He
authors: Anhui Provincial Institute of Schistosomiasis Control, Hefei 230061, China.
authors: Ting-ting
authors: TT
authors: Li
authors: Anhui Provincial Institute of Schistosomiasis Control, Hefei 230061, China.
authors: Tian-ping
authors: TP
authors: Wang
authors: Anhui Provincial Institute of Schistosomiasis Control, Hefei 230061, China.
authors: Gong-hua
authors: GH
authors: Zhang
authors: National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention. Email: lisz@chinacdc.cn.
authors: Shi-zhu
authors: SZ
authors: Li
mesh_terms: D000818:Animals; D002681:China / Q000453:epidemiology; D004777:Environment; D040362:Geographic Information Systems; D012552:Schistosomiasis / Q000453:epidemiology*; D012908:Snails / Q000469:parasitology*; D013029:Space-Time Clustering