title: [Retrospective investigation of schistosomiasis endemic situation in Hunan Province].
abstract: OBJECTIVE
  To understand the dynamic rules of schistosomiasis endemic situation before and after reaching the criteria of schistosomiasis transmission controlled or transmission interrupted, so as to provide the evidence for improving schistosomiasis control.
  
  
  METHODS
  Wuling District, Xihu District and Linli County were selected and investigated retrospectively to collect the schistosomiasis epidemiological information 10 years before they reached the criteria of transmission controlled and the subsequent years until 2008. A database of retrospective investigation was established for analyzing the trends and rules of changes of the Oncomelania hupensis snail status and infection status of cattle and human.
  
  
  RESULTS
  In Wuling District, the endemic situation was declining, and no schistosome infection persons, animals and snails were found after 1974. There was no rebound until 2008. In Xihu District, the endemic situation reached the criteria of transmission controlled in 1997, and the endemic situation was stable. The human infection rate was positively correlated with the area of infection snails (r = 0.584, P < 0.05). In Linli County, there were no snails, no infected persons and cattle twice, but 2 endemic rebounds, and there were positive correlations between the densities of living snails and the infection rates of human and animal during the endemic rebound period.
  
  
  CONCLUSIONS
  The snail status is an important indicator of schistosomiasis endemic rebound. Therefore, the snail control is one of the most important schistosomiasis control measures.
authors.forename: Yang-qing
authors.initials: YQ
authors.lastname: Han
authors.forename: Ben-Jiao
authors.initials: BJ
authors.lastname: Hu
authors.forename: Ying-cai
authors.initials: YC
authors.lastname: Zhou
authors.forename: Xing-rao
authors.initials: XR
authors.lastname: Wang
authors.forename: Ke-jian
authors.initials: KJ
authors.lastname: Liu
authors.forename: Yue-ming
authors.initials: YM
authors.lastname: Wang
authors.forename: Shi-hua
authors.initials: SH
authors.lastname: Meng
authors.forename: Guang-ping
authors.initials: GP
authors.lastname: Li
authors.forename: Guang-hui
authors.initials: GH
authors.lastname: Ren
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology* / Q000469:parasitology / Q000635:transmission; D002648:Child; D002681:China / Q000453:epidemiology; D004197:Disease Reservoirs / Q000469:parasitology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012547:Schistosoma / Q000502:physiology; D012552:Schistosomiasis / Q000453:epidemiology* / Q000469:parasitology / Q000635:transmission / Q000662:veterinary*; D012908:Snails / Q000254:growth & development / Q000469:parasitology; D055815:Young Adult