1. To explore and compare the prevalence of helminths in fish flake white leaf stage of contact, and snails. The wetland Nong Luang, Chiang Rai, wiang Chai in 3 season, summer rainy season and winter
2.To study the food consumption behavior of the residents of nearby areas of wetlands Nong Luang District wiang Chai Tai
3.To investigate the relationship of consumption behavior on the prevalence of helminths in fish flake white leaf stage of contact and the eggs in the feces of people
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