血吸虫病易感地带围栏放牧试点研究

目的　探讨血吸虫病易感地带围栏放牧对降低血吸虫感染性的效果。方法建立围栏放牧试点并设对照区纵向观察血吸虫病疫情变化。结果　实验区 (A) 2 0 0 0年与 1998年比较 ,居民血吸虫病感染率下降 6 5 83% ;而对照区 (B) ,居民血吸虫病感染率仅下降 2 0 0 0 % (u =11 0 4 ,P <0 0 1)。A区牛血吸虫病感染率下降了 6 7 2 1% ,B区仅下降 0 8% (u =12 37,P<0 0 1)。 3年中A区阳性螺密度分别下降了 71 19% ,77 14 % ,10 0 %。且草场仅第一年发现野粪阳性率为 11 36 % ,而B区则年均野粪阳性率均在 10 %以上。结论实施围栏放牧不仅可大大的降低牛血吸虫病感染 ,消除传染源 ,降低湖洲易感地带的感染性 ,同时也使当地的居民血吸虫病感染率有所降低。

Study on Fence Pasture Outside Embankment in Schistosomiasis Susceptible Zone

Aim To find out the effect of decreasing schistosomiasis infection by applying fence pasture outside embankment in schistosomiasis susceptible zone Method Two types of areas were set up,one with fence pasture(test areas A) and another control areas without special setting(control areas B),then longitudinally observe the Schistosoma japonicum endemic condition in two types of areas Results 1 Compared year 2000 with year 1998,the resident infection rate of schistosomiasis was decreased by 65 83% in test areas and 20 00% in control areas There was a significant decrease of infection rate in test areas;2 Compared year 2000 with year 1998,the cattle's infection rate of schistosomiasis was decreased by 67 21%in test areas and 0 8% in control areas There was a significant decrease of infection rate in test areas;3 ,Compared areas A with areas B,the density of positive snail were reduced by 71 19%,77 14%,100% during respective year;4 The positive rate of wild feces was 11 36% in A grass farm only in 1998 and more than 10 00% in B grass farm yearly Conclusion Fence pasture not only decreased cattle's infection rate,eliminated transmission source and reduced the infection intensity in lake and marshland,but also significantly decreased the local resident infection rate of schistosomiasis