Abstract:

Objective  To understand the snail distribution trend in the inner embankment within Hunan province by descriptive analysis of the data based on the general survey of snail prevalence in the inner embankment from 2011 to 2016, in order to plan scientific measures to further reduce the snail ridden areas. Methods The data were collected from the  general survey of snail distribution in the inner embankment in Hunan province in 2011, 2014 and 2016, and statistically analyzed. Results  The areas with snails and environments with snails were fallen significantly from 2011 to 2014, yet the decrease was slow between 2014 and 2016. No areas of snail re-emergence or new emergent snail areas were found in the embankment in 2016 throughout the province, and no infected snails were found in three surveys. Snail prevalence in the inner embankment was associated with marshland and mountainous endemic areas. Conclusion  Snail habitats tend to decrease in 2016 compared to 2011 and 2014 in the inner embankment in Hunan province. Following measures and tasks should focus on continuous use of molluscicide, hardening conduits and land formation for effective reduction of snail ridden areas and complete cut-off the route of schistosome transmission.

Key words: Hunan Province, Snail in inner embankment, Distribution, Control strategy