| echinostoma revolutum: freshwater snails as the second intermediate hosts in chiang mai, thailand. | the occurrence of 37-collar spined echinostome metacercariae in freshwater snails was investigated in 6 districts of chiang mai province, thailand, from october 2011 to april 2012. a total of 2,914 snails that belong to 12 species were examined, and 7 snail species (clea helena, eyriesia eyriesi, bithynia funiculata, bithynia siamensis siamensis, filopaludina doliaris, filopaludina sumatrensis polygramma, and filopaludina martensi martensi) were found infected with echinostome metacercariae. the ... | 2013 | 23710085 |