title: [Evaluation of molluscicidal effects of contracted responsibility system in Changshan County].
abstract: OBJECTIVE
  To explore a new molluscicidal pattern suitable for the complicated environments in hilly regions, so as to provide the evidence for making the strategy of Oncomelania snail control.
  
  
  METHODS
  The contracted responsibility system for snail control was implemented by government. The quality of control work was evaluated in the same year and the recent molluscicidal effect was assessed in the next spring.
  
  
  RESULTS
  After the intervention, the decline rate of snail areas increased from 53.4% to 100%; the compression rate of snail spots increased from 54.6% to 100%; the input of fund for snail control decreased from 2.03 Yuan/m2 to 0.69 Yuan/m2; the cost of snail control decreased from 3.73 Yuan/m2 to 0.75 Yuan/m2; the work efficiency increased from 12.0 m2/(man x day) to 36.7 m2/(man x day); the molluscicide decreased from 7.50 tons/year to 3.20 tons/year and the decline rate was 57.3%. The awareness rate and recognized rate of the contracted responsibility system for snail control were both 92.5%.
  
  
  CONCLUSIONS
  The contracted responsibility system for snail control can increase financing efficiency, molluscicidal quality and work efficiency, and save molluscicide in complicated environments of hilly regions.
authors.affiliation: Changshan Center for Disease Control and Prevention, Zhejiang Province, Changshan 324200, China.
authors.forename: Qing-Hua
authors.initials: QH
authors.lastname: Xu
authors.forename: Xing-Tu
authors.initials: XT
authors.lastname: Huang
authors.forename: You-Hua
authors.initials: YH
authors.lastname: Jiang
authors.forename: Jian-Hua
authors.initials: JH
authors.lastname: Liu
mesh_terms: D000818:Animals; D008975:Molluscacides / Q000191:economics / Q000494:pharmacology*; D010571:Pest Control; D012549:Schistosoma japonicum / Q000187:drug effects*; D012554:Schistosomiasis japonica / Q000191:economics / Q000517:prevention & control*; D012908:Snails / Q000187:drug effects* / Q000254:growth & development / Q000469:parasitology
chemical_list: D008975:Molluscacides