*2.2. Intervention Measures*

Sanlian village applied molluscicide (solid pentachlorophenol) on snails' habitats every spring during 1981–1984, and simultaneously administered praziquantel to people with positive fecal examination. Guifan village only administered praziquantel to subjects with positive fecal tests. After 1984, the different control measures were all stopped, and two villages began to follow the same control strategies: (1) by local governmen<sup>t</sup> in 1985–1991. (2) recommended by the World Bank Loan Project (WBLP) in 1992–2001. (3) by the continued WBLP measures in 2002–2004. (4) since 2005, the integrated schistosomiasis control strategy has been carried out. Table 1 provides detailed information on the intervention measures from 1981 to 2017.
