Study of the effect on reduction of schistosomiasis endemic situation by water conservancy comprehensive measures in the area of embankment schistosomiasis endemic type
Objective To evaluate the schistosomiasis endemic situation in the drainage area of Xigan Canal after control by water conservancy comprehensive measures in order to offer evidence for schistosomiasis control of embankment type.Methods In the drainage area of Xigan Canal around 500 m,31 villages where the water conservancy comprehensive measures were complemented were selected as study sites,other 167 villages out of 500 m without water conservancy comprehensive measures were selected as control sites.The water conservancy comprehensive measures consisted of killing snail by molluscicide firstly,digging and dredging secondly,and setting up snail collection and killing pools thirdly.The data of schistosomiasis situation and control of 2006-2014 were collected,and the index of human,cattle and snail infection were analyzed.Results The schistosomiasis infection rate of people and livestock was 11.83％and 6.11％respectively,and the infection rate of snail was 0.418 7％.This comprehensive measures of water conservancy in schistosomiasis control projects an area of 380.50 ha(1 ha=10 000 m2)was completed with molluscide treatment,4 576 400 m3 with excavation dredging,and 187 000 m3 with earth excavation,and 151 200 m3 with backfill,12 snail-setting pools were built and 12 km channel hardened.From 2006 to 2014,the schistosomiasis infection rate of human decreased from 4.39％to 0,a decline rate of 88.56％,and the schistosomiasis infection rate of livestock fell from 11.75％to 0,a decline rate of 100％in the study villages.The area of positive snail shrank year by year,and it was 2.16 ha in 2011 in the study village,with a decline by 94.96％(2.16/39.00).The difference of schistosomiasis infection rate of people between observation villages and control villages had statistic significance by Chi-square test(x2=64.06,52.94,36.01,6.96,P＜0.01)during 2006-2009,and the schistosomiasis infection rate of study villages was higher than that of control villages.But after 2010,the schistosomiasis infection rate had no statistic difference(x2=2.33,0.30,0.59,P＞0.01).The different infection rate of snail between study village and control village had statistic significance(x2=827.48,395.68,164.88,6.96,P＜0.01).The infection rate of snail was 0.522 1％,0.283 3％,0.167 0％in study villages in 2006,2007,2008 respectively,and it was higher than that of control villages(0.159 8％,0.088 5％,0.064 3％).After the completion of this project,there was statistic significance(x2=37.45,9.35,33.65,P＜0.01)in the infection rate of snail between study villages and control villages during 2009-2011.The annual infection rate of snail was 0.044 8％,0.045 4％,0.007 0％in study village during 2009-2011,much lower than that of control village(0.097 1％,0.1365 9％,0.033 0％).Conclusion In the area of embankment type of schistosomiasis,the schistosomiasis endemic situation was reduced by water comprehensive measures.
SchistosomiasisEmbankment typeSchistosomiasis control measures by water conservancyEffect evaluation
NETL
NSTL
万方数据
维普
