The dynamic analysis on the distribution of snails from 2005 to 2013 in Shitai County
Objective To analyze the distribution features and trend of snails from 2005 to 2013 in Shitai County,thus to provide evidence for formulating control measures on snail.Methods A retrospective investigation method was applied.The survey data from annual schistosomiasis control statement of spring snail from 2005 to 2013 in Shitai County were collected,then the database were established for statistical analysis on the snail parameter changes such as the existance and infected snail's area,living snail and infected snail's density in different water systems,environment,epidemic situation categories.Results The snail's area in Shitai County was 285.33 ha(1 ha=10 000 m2),infected snail area was 20.29 ha in 2005,mainly distributed in Qiupu River,Huangpen River and Qingxi River.96％ of the snail area and 100％ of infected snail area were distributed in Qiupu River and Huangpen River.Ditces and rivers were the main environment for distribution of snail and infected snail.The trend of snail areas was declining in 9 years,from 285.33 ha in 2005 fell to 258.20 ha in 2013.Total 136 infected snail area at 20.29 ha declined to 0 m2 from 2005 to 2013.The environment of the infected snail was mainly distributed in the villages without spread control,but it also appeared repeatedly in the villages with spread control.Living snail density decreased 76.2％,from 4.79/0.1 m2 down to 1.14/0.1 m2.The rate of living snail decreased by 22.17％ (x2=4 953.6,P＜0.01).Linear correlation analysis showed that living snail density and infection snail density were positively correlated (r=0.755,P＜0.05).Conclusion The snails situation showed a down trend in Shitai County,while the implementation of comprehensive control measures with emphasis on infection source control,The snail situation control should still be trengthened.
Oncomelania snailInfected snailDistributionChange trendShitai County
NETL
NSTL
万方数据
维普
