ABSTRACT
Objective To understand the dynamic of Oncomelania hupensis snail status in Duchang County at north shore of Poyang Lake so as to provide the evidence for formulating the strategy of schistosomiasis control. Methods The data about the snail status in Duchang County from 2005 to 2012 were collected and the change trend of the snail status was analyzed. Re?sults From 2005 to 2012 all the average density of living snails the occurrence rate of frames with living snails the density of infected snails and the area with infected snails showed a trend of sharp decline and stayed at a low level. Compared to 2005 the above 4 indexes in 2008 decreased by 70.06% 90.33% 79.48% and 37.88% respectively and those in 2012 decreased by 99.35% 98.98% 99.33% and 93.84% respectively. The infection rates of snails fluctuated between 0.06%and 0.53%which showed a trend of first decrease and then increase. The snail area maintained at the level of 2 052.5 hm2 since 2007. Con?clusions Most of the indexes of the snail status in Duchang County have decreased to the lowest level in history since 2012 but the snail area is stable and the infection rate of snails shows a fluctuation trend which suggests that the risks of schistosomia?sis transmission still exist and the snail control still should be strengthened.
ABSTRACT
The endemic situation of schistosomiasis in Tangyin Village of Duchang County from 2000 to 2007 showed the infection rates of residents between 2003 and 2007 were all around 10%.In 2000.2002 and 2007,the infection rates of snails were 0.32%,O.45%and 0.38%,respectively,and the densities of infected snails were 0.016,0.004 No./0.1 m~2.and 0.004 No./0.1 m~2,respectively.It is suggested that the snail control and health education should be strengthened and the self-protection awareness of residents should improve for schistosomiasis control.