[Surveillance of schistosomiasis in Jinbao Channel areas in east route of South-to-North Water Diversion Project].

OBJECTIVE

To understand the dynamic of the endemic situation of schistosomiasis in Jinbao Channel areas, so as to provide the evidence for surveillance and early-warning of schistosomiasis in the east route of the South-to-North Water Diversion Project.

METHODS

The conventional methods were used for the surveillance of Oncomelania hupensis snails in the first grade tributary and the flood land of Jinbao Channel. The methods of net salvage and attracting snails with rice straw curtains were used for snail surveys underwater in the surveillance sites. The residents, fishermen and crew were surveyed for schistosomiasis in the regions along the Jinbao Channel. The situation of the fishing boats carrying snails were surveyed, too.

RESULTS

The accumulated areas where snails checked were 364.20 hm2. A total of 2 785 kg floats were collected and 400 pieces of rice straw curtains were placed in the surveillance sites, but no snails were found from 2006 to 2010. A total of 7 951 persons were surveyed for schistosomiasis by the serological test, and the total positive rate was 0.92%. The positive rates in the residents and fishermen were 0.79% and 1.55%, respectively. The fishmen's seropositive rate was higher than the residents' (chi2 = 7.11, P < 0.01). A total of 65 people received fecal examinations and there was one infected case. A total of 54 fish boats and 93 fishing gears were detected and no snails were found.

CONCLUSIONS

There are no snails and schistosomiasis transmission, but there are the risks of imported schistosomiasis infectious source in the regions along the Jinbao Channel in the east route of the South-to-North Water Diversion Project, therefore, the long-term surveillance is necessary.