Abstract: 　Objective To identify the trends of endemic situation at the twenty-one national surveillance sites from 2000 to 2002. Methods According to the protocol of the national surveillance system, longitudinal surveillance of endemic situation of schistosomiasis was carried out at the twenty-one surveillance sites since 2000. Results Relative indexes of endemic situation of schistosomiasis decreased in two surveillance sites annually. The infection rate of Schistosoma japonicum in human population decreased in most surveillance sites. The infection rate of cattle decreased in eight surveillance sites. However, acute cases were found in two sites each year. The density of live snails and infected snails was higher compared with that in 2000 among eight sites and infected snails were found in inner embankment in Junshan surveillance sites, Hunan Province, in 2002 at first time. The snail ridden areas increased significantly in Fengjin sites, Shanghai, where schisotomiasis was eliminated years ago. Conclusion Current control strategies have some impact on the morbidity of schistosomiasis. However, these strategies should be lasted for longer time and surveillance on snails should be enhanced.

Key words: schistosomiasis, endemic situation, surveillance