Objective To specify the trends of endemic situation among twenty one national surveillance sites for schistosomiasis from 2000 to 2004. Methods According to the national surveillance protocol, longitudinal surveillance on endemic situation of schistosomiasis was carried out at twenty-one sites since 2000. Results The infection rate of Schistosoma japonicum declined in six of the twenty-one surveillance sites. The density of living snails and of infected snails decreased in two sites but not well controlled...
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