Investigation on soil-transmitted nematode and liver fluke infections of Shandong regions receiving water regions by the South-to-North Water Diversion.

Objective To investigate the status of soil-transmitted nematode infection and Clonorchis sinensis infection in eastern route of Shandong receiving water regions before transferring water from South to North. Methods Target population in countries along rivers transferring water were random sampled using Kato-kata method checking all the target population, and using mopping anus method by transparency plaster checking children from 1 to 12 in target population. Results There 21 spots in 7 countries were surveyed , and 10 510 persons were examined and 5 species of parasites including ascarid, hookworm, Trichuris trichura, pinworm and liver fluke were identified . The infection rate of soil - transmitted nematode was 3.72%,and that of liver fluke was 0.06%,and the total infection rate of was 3.79%. The rate of one parasite infection was 76.69%. Conclusion Changes of entironment in receiving water regions may accelerate prevalence and spread of soil-transmitted nematodes and liver fluke. By taking interference measures, such as seting up monitoring sites strengthening health education and eliminating source of infection, can reduce the prevalence of the parasites in receiving water regions.