| potential health hazards of the water resources development: a health survey in the phitsanulok irrigation project, nan river basin, northern thailand. | a health survey was carried out among residents of 33 villages under the phitsanulok irrigation project area, nan river basin, northern thailand, whereby general health conditions were examined including intradermal tests for schistosomiasis japonica, stools for intestinal parasites and sera tested by circumoval precipitin test for antibodies to s. japonicum and by agglutination test for leptospiral infection. health investigations revealed that 913 (60.9%) of 1,499 people examined had experienc ... | 1980 | 7221699 |