A survey was conducted to investigate the prevalence of food-borne trematode metacercariae in intermediate hosts in the lower Lancang River basin from Aug.2009 to July 2010.The survey was done to provide evidence for food-borne trematode prevention and control.Samples of fish,frogs,and crabs were examined by artificial digestion or precipitation and washing.Three species of metacercariae,Haplorchis pumilio,Centrocestus formosanus,and Metorchis orientalis Tanabe,were mainly detected from the samples.Dwarf sn...